Court Opinion

ID: 4303532
Source: CourtListenerOpinion
Date Created: 2018-08-14 16:01:39.319183+00
Date Added: 2024-06-11T09:36:29.167550
License: Public Domain

In the United States Court of Federal Claims
                             OFFICE OF SPECIAL MASTERS
                                   Filed: July 5, 2018

* * * * * * * * * * * * *                  *   *
KATIE SMITH,                                   *
                                               *
               Petitioner,                     *      No. 14-848V
                                               *      Special Master Sanders
v.                                             *
                                               *      Entitlement Hearing; Denial of Entitlement;
SECRETARY OF HEALTH                            *      Hepatitis B (“Hep B”) Vaccine; Transverse
AND HUMAN SERVICES,                            *      Myelitis (“TM”); Althen Causation; Althen
                                               *      Prong One; Althen Prong Two; Althen Prong
          Respondent.                          *      Three
* * * * * * * * * * * * * *                    *

Diana L. Stadelnikas, Maglio, Christopher and Toale, PA, Sarasota, FL, for Petitioner.
Darryl R. Wishard, United States Department of Justice, Washington, DC, for Respondent.

                               DECISION ON ENTITLEMENT1

        On September 12, 2014, Katie Smith (“Petitioner”) filed a petition pursuant to the National
Vaccine Injury Compensation Program.2 Petitioner alleged that the Hepatitis B (“Hep B”) vaccine
that she received on April 18, 2013 caused her to develop Transverse Myelitis (“TM”).

        After carefully analyzing and weighing all of the evidence and testimony presented in this
case in accordance with the applicable legal standards, the undersigned finds that Petitioner has
not met her legal burden. Petitioner has failed to provide preponderant evidence that the Hep B
vaccination Petitioner received on April 18, 2013 caused her to develop TM. Accordingly,
Petitioner is not entitled to compensation.

1
  This decision shall be posted on the United States Court of Federal Claims’ website, in
accordance with the E-Government Act of 2002, 44 U.S.C. § 3501 note (2012) (Federal
Management and Promotion of Electronic Government Services). In accordance with Vaccine
Rule 18(b), a party has 14 days to identify and move to delete medical or other information that
satisfies the criteria in § 300aa-12(d)(4)(B). Further, consistent with the rule requirement, a motion
for redaction must include a proposed redacted decision. If, upon review, the undersigned agrees
that the identified material fits within the requirements of that provision, such material will be
deleted from public access.
2
 The Program comprises Part 2 of the National Childhood Vaccine Injury Act of 1986, 42 U.S.C.
§§ 300aa-10 et seq. (hereinafter “Vaccine Act,” “the Act,” or “the Program”).
         I.    Procedural History

        This case was originally assigned to Special Master Hamilton-Fieldman. See ECF No. 4.
Petitioner filed sixteen medical records on September 19, 20143 and one additional medical record
on October 14, 2014. See Notice of Filing Pet’r Exs. 1-16 on CD, ECF No. 5; Pet’r Ex. 17, ECF
No. 12. After subpoenas were authorized, Petitioner submitted ten additional exhibits. See Notice
of Filing Pet’r Exs. 18-20 on CD, ECF No. 14; Pet’r Exs. 21-26, ECF No. 17; Pet’r Ex. 27, ECF
No. 18. She filed a statement of completion on December 29, 2014. ECF No. 19. Petitioner then
filed an expert report on August 14, 2015. Pet’r Ex. 28, ECF No. 34.

        Respondent filed a Rule 4(c) Report on February 8, 2016. ECF No. 44. In his Report,
Respondent agreed with the diagnosis of TM and agreed that Petitioner suffered from residual
effects or complications of TM for more than six months. Id. at 8. However, Respondent argued
that compensation is not appropriate in this case, because Petitioner did not provide a “reliable,
persuasive, explanation or theory as to how the Hep B vaccine can play a role in causing TM in
general, or how it did so based on the specific facts of her case.” Id. at 8. Respondent further
opined that the length of time between the vaccination and Petitioner’s onset of symptoms “is too
long for the Hep B vaccine to have caused [P]etitioner’s TM based on [Petitioner’s expert’s] theory
of molecular mimicry.” Id. at 9. In support of his position, Respondent filed an expert report on
the same day as his Rule 4(c) Report. Resp’t Ex. A, ECF No. 44-1.

        Petitioner then filed seven additional medical records and a supplemental expert report.
Pet’r Exs. 43-48, ECF No. 46; Pet’r Ex. 49, ECF No. 49; Pet’r Ex. 50, ECF No. 51. At a status
conference held on August 15, 2016, Petitioner sought to schedule an entitlement hearing, but
Special Master Hamilton-Fieldman and Respondent’s counsel questioned the efficacy of a hearing
in this case. Scheduling Order, ECF No. 53. Petitioner’s counsel requested the opportunity for
Petitioner to be heard at an entitlement hearing, and later elaborated that a hearing would be
necessary to expand upon Petitioner’s expert’s opinions and to provide the opportunity to cross-
examine Respondent’s expert. Id.; Pet’r Status Report, ECF No. 55.

        The case was reassigned to the undersigned on January 10, 2017. See ECF Nos. 56, 57.
An entitlement hearing was set for December 8, 2017. Hearing Order, ECF No. 60. Petitioner
filed three additional medical records before the hearing. Pet’r Exs. 62-64, ECF No. 69. The
hearing was held on December 8, 2017.

3
  The CD filed on September 19, 2014, which contained Petitioner’s Exhibits 1-16, was stricken
from the record due to missing page numbers on two of the exhibits. See Ord. Striking CD, ECF
No. 72. However, all of the exhibits were later re-filed. See Notice of Intent to File on CD, ECF
No. 73; Unnumbered Entry (Dec. 4, 2017).

                                                2
         II.   Factual Background

                       A. Medical Records

        Petitioner filed thirty-seven medical records. Pet’r Exs. 1-27, 43-49, 62-64. The medical
records from prior to Petitioner’s Hepatitis B vaccinations reflect that she was a female in her early
twenties, with the majority of her medical visits relating to a pregnancy or intermittent low back
pain. Petitioner’s records also reflect that her back pain worsened after she received an epidural
during childbirth. See, e.g., Pet’r Exs. 7 at 204-235, 14 at 7-8, 23 at 182; see generally Pet’r Ex.
13. Petitioner smoked and reported occasional alcohol use to some providers. Pet’r Ex. 13 at 180;
Pet’r Ex. 14 at 7. A report from the North Okaloosa Medical Center dated February 28, 2012
reflects that Petitioner had presented to that emergency department twenty-one times in the prior
eight years. Pet’r Ex. 7 at 203. Six of those visits were detailed on that report and reflect that
Petitioner was seen for an allergic reaction, back pain, a rash, cystitis, dysmenorrhea, and a post-
cesarean wound infection. Id.

       Petitioner received the first Hep B vaccine of the series at issue here on October 15, 2012.
Pet’r Ex. 15 at 1-2. She received the second on November 16, 2012, and the third on April 18,
2013. Id. at 1; Pet’r Ex. 48 at 3. The only medical visit documented between the first and third
vaccination was a visit to a hospital on February 8, 2013 for ear and eye problems. Pet’r Ex. 11 at
105-130. She was diagnosed with otitis media and bacterial conjunctivitis on that date. Id.

        On June 24, 2013, sixty-seven days after her third Hep B vaccine was administered on
April 18, 2013, Petitioner reported to Twin Cities Hospital with complaints of shortness of breath,
abdominal pain, and numbness on the right side of her body. Pet’r Ex. 11 at 74. Dr. Louis Vagias,
an emergency room physician, documented that Petitioner complained of sudden-onset abdominal
pain which radiated to the middle of her back. Id. at 39. She also complained of decreased
sensation, which started with right lower numbness and difficulty walking and then progressed to
“bilateral[] numbness.” Id.

       Dr. Vagias obtained a neurology tele-medicine consult from Dr. Mitch Rubin. Pet’r Ex.
11 at 52-56. Dr. Vagias reported that a workup for possible abdominal causes was negative. Id.
at 53. Although abdominal pain had resolved, Petitioner’s lower extremity numbness persisted
from approximately T6 downward, and she had developed bilateral lower extremity weakness. Id.
Dr. Rubin reported that acute thoracic disc, TM, and aortic dissection were possible considerations,
and recommended that the hospital obtain an MRI of the thoracic and cervical spine, as well as a
CTA of the thoracic aorta. Id. at 54.

        The hospital obtained MRI imaging of Petitioner’s cervical and thoracic spine. Pet’r Ex.
11 at 85-86. Petitioner was admitted and the next day she was transferred to another hospital, Fort
Walton Beach Medical Center. Id. at 36-37, 57; Pet’r Ex. 12 at 8-9. The attending physician at
that hospital, Dr. Gustavo Ros, noted that the patient’s cervical spine MRI was “essentially within
normal limits.” Pet’r Ex. 12 at 8. He also noted that her thoracic spine MRI “showed a small focal
disk protrusion, central, lateralizing slightly to the right at T7 and T8, which w[as] causing
effacement of the ventral thecal sac and minimal ventral impression upon the thoracic spinal cord.”
Id. Because no remarkable findings were observed on the thoracic and cervical spine MRIs, Dr.

                                                  3
Ros ordered an MRI of the lumbar spine. The MRI of her lumbar spine reflected a central disc
protrusion or possible disc herniation at the L1-L2 level, but no additional significant findings. Id.
at 105-06.

        A consulting doctor, Dr. Roman Kutsy, stated in his report that “[t]he main diagnosis that
would be the most rational with [Petitioner’s] clinical presentation is [TM].” Pet’r Ex. 12 at 10.
However, he noted that “the thoracic spine MRI obtained the day prior was “normal,” and although
it was done without contrast, “it is not very likely that even [a] non[-]contrast MRI of the thoracic
spine would overlook[] [a] lesion of the spinal cord.” Id. Thus, he opined that there was “no clear
neurologic explanation” for Petitioner’s symptoms based on his review. Pet’r Ex. 12 at 10. Dr.
Kutsy documented that the patient’s symptoms occurred acutely the day prior, beginning with an
“intense numbing and tingling sensation in her right foot,” and progressing “so much that she
became non[-]ambulatory.” Id. at 10-11. He also noted the following:
       [Petitioner] had some vague symptoms for a few days prior to that. Five days ago,
       while at work, she developed some numbness in the face, which affected primarily
       [her] mouth and tongue in [a] bilaterally symmetric manner. She “did not feel well”
       and called her mother and complained of that. For the next few days, she continued
       to have intermittent problem[s] with generalized fatigue and numbness in the face
       and mouth, which was symmetric.
Id. Dr. Kutsy ordered an MRI of Petitioner’s brain to “rule out MS,” suggested follow-up testing
based on the results of the pending MRI scans, recommended physical and occupational therapy,
and noted that Petitioner’s symptoms presented “a very puzzling case.” Id. at 10. He also wrote
that he could not rule out the possibility that Petitioner’s “presentation may be . . . psychogenic in
nature.” Id.

       The next day, June 26, 2013, Dr. Ros documented that Petitioner reported “feeling better,”
and that her “[l]ower ext[remity] symptoms and abd[ominal] symptoms [were] resolving.” Pet’r
Ex. 12 at 37, 39. Dr. Ros further noted that Petitioner was “adamantly refusing [a] lumbar
puncture,” and that the risks of so refusing were explained to her. Id. at 40. That same day, Dr.
Kutsy wrote that there was no evidence of spinal cord or nerve root disease or “peripheral
neuropathic process” such as Guillain-Barre Syndrome (“GBS”), myopathy, or Multiple Sclerosis
(“MS”). Id. at 46. The MRI of Petitioner’s brain resulted in no significant findings. Id. at 104-
05. Dr. Kutsy’s assessment concluded that Petitioner’s “clinical presentation [was] highly
suspicious for psychogenic weakness,” and he recommended a psychology consultation. Id. at 46.
On June 28, 2013, Dr. Kutsy documented a diagnosis of “[p]sychogenic leg weakness,” as well as
an “L1-2 disc protrusion that can not explain all of [Petitioner’s] symptoms.” Id. at 42.

        Between June 27, 2013 and July 2, 2013, Dr. Ros continued to document that the patient
reported “feeling better,” despite continued lower extremity weakness and numbness. Pet’r Ex.
12 at 12-28, 31-33, 41-42. He also wrote that he “[d]iscussed [the] case at length” with another
physician, including the possibility of a lumbar disc herniation. Id. at 33, 35-36. Petitioner
participated in a physical therapy session on June 27, 2013, which she tolerated “fairly well.” Id.
at 109. She was evaluated by the occupational therapy department on July 1, 2013, but she reported
to the evaluator that she would not go to an inpatient rehabilitation center, because “she want[ed]
to get home to her daughter.” Id. at 110. Dr. Ros’s notes reflect that he ordered a continuation of
the same plan of physical therapy during this time period. Id. at 12-28, 31-32, 41-42. Petitioner
                                                  4
was discharged from Fort Walton Beach Medical Center on July 3, 2013 with instructions to follow
up with a primary care physician and physical therapy. Pet’r Ex. 12 at 48, 95, 221, 226-27.

        One day after her discharge from Fort Walton Beach Medical Center, Petitioner reported
to the North Okaloosa Medical Center with a urinary tract infection, where a nurse noted her
continuing neurological symptoms. Petitioner followed up with a physician, Dr. Kapil Puri, on
July 8 and 9, 2013, with continued complaints of urinary retention. Pet’r Ex. 47 at 2-4.

        On July 10, 2013, Petitioner again reported to the North Okaloosa Medical Center
emergency room with complaints of abdominal pain and inability to urinate or void. Pet’r Ex. 7
at 101. Upon examination, Dr. Martin Mondry noted that Petitioner had been recently hospitalized
and diagnosed with a herniated disc, although he documented that she “ha[d] symptoms out of
proportion to injury, was ‘paralyzed’ and continue[d] to have progressive loss of sensation and
function.” Id. at 102. Dr. Mondry and another treating physician at North Okaloosa Medical
Center, Dr. Christopher Singley, consulted with other doctors and determined that the patient
should be transferred for neurosurgery evaluation at Sacred Heart Hospital. Id. at 105-06.
Petitioner was transferred to Sacred Heart the same day. Id. at 111.

        At Sacred Heart, Petitioner was evaluated by Dr. George Dmytrenko. Pet’r Ex. 10 at 8-9.
Dr. Dmytrenko wrote that Petitioner’s symptoms began approximately June 25, and that she was
admitted to Fort Walton Beach Hospital where MRI scans of the brain and lumbosacral spines
were performed. Id. Dr. Dmytrenko stated that “[s]he was allegedly seen by a neurologist who
could not make a diagnosis,” and that Petitioner’s mother relayed that Petitioner was sent home
after being told “this is all in your head.” Id. Dr. Dmytrenko observed that Petitioner had
“improved slightly,” but that her strength in her legs was “not nearly what it [wa]s in her arms.”
Id. He also noted that the sensory level remained “at a vague area between the breast and the
navel.” Id. Dr. Dmytrenko reviewed the MRI scans of the brain and lumbar spine from Fort
Walton Beach Medical Center, although he wrote that “[t]here was no attempt to obtain an MRI
scan of the cervical or thoracic spine.”4 Id. at 9. In summary, he stated that Petitioner had a “[TM]
type picture, predominantly involving sensory and less so motor components. She has had mild
improvement but still has sensory level at about T6 and paraparesis.” Id. Dr. Dmytrenko ordered
MRIs of the cervical and thoracic spine. Id. at 23.

         The next morning, July 11, 2013, Dr. Dmytrenko wrote in the chart that the MRI scan of
Petitioner’s cervical spine was normal, but that the MRI scan of her thoracic spine “demonstrate[d]
a spindle-shaped area of demyelination and inflammation with a fusiform enlargement of the cord
at about T6 through T8.” Pet’r Ex. 10 at 7; see also id. at 75-76. He outlined a plan to treat the
patient with steroids. Pet’r Ex. 10 at 6-7. Dr. Dmytrenko noted that “[t]he major issue at the
present time is rehabilitation.” Id. at 6. On July 13, 2013, Petitioner was discharged to an inpatient
rehabilitation center at West Florida Hospital for “intense physical therapy.” Id. at 6. Her
diagnoses at time of discharge were subacute TM, paraparesis, and bowel and bladder dysfunction.
Id. at 6, 95.

4
    But see Pet’r Ex. 11 at 85-86.
                                                  5
        Upon admission at West Florida Hospital Rehabilitation Institute, Petitioner reported that
she continued to have significant numbness and tingling sensation in both legs that was slowly
improving. Pet’r Ex. 19 at 21. She also reported significant bowel symptoms and significant pain,
particularly “in the T7-T8 level between the scapula which was intermittent[, but s]he denied any
significant weakness of her legs or arms.” Id. Petitioner received physical and occupational
therapy, along with psychological support, while at the facility. Id. at 28-82. Petitioner was
discharged from West Florida Hospital Rehabilitation Institute on July 30, 2013. Id. at 17-20.

       Petitioner’s medical records reflect that she continued to follow up with various physicians,
and continued to have residual symptoms related to her TM, including bowel and bladder
problems, pain, and weakness, through at least 2017.5 See Pet’r Ex. 1 at 2-15; Pet’r Ex. 2 at 2-17,
32-45, 77-80; Pet’r Ex. 4 at 2-35; Pet’r Ex. 5 at 3-24; Pet’r Ex. 7 at 2-100; Pet’r Ex. 11 at 1-28;
Pet’r Ex. 14 at 2-6; Pet’r Ex. 16; Pet’r Ex. 24; Pet’r Ex. 44; Pet’r Ex. 63.

                         B. Petitioner’s Fact Testimony

        Petitioner testified by video teleconference at the hearing and noted that she reviewed her
medical records in preparation. Tr. 10. Petitioner testified that in 2013, she “was a healthy 23
year old mom.”6 Id. at 11. She described herself as “[f]ully healthy,” and testified that she did
Zumba three times per week and walked in the morning. Id. Petitioner testified that she worked
full-time and went to school full-time at night. Id. She was training to be a medical assistant. Id.
As part of that training, she was required to complete an externship. Id. In preparation for the
externship, she was required to receive the series of Hep B vaccinations. Id. at 11-12. Petitioner
recalled receiving Hep B vaccines in October 2012, November 2012, and April 2013. Id. at 12.

        Petitioner testified that “about five days or more, give or take,” before June 24, 2013, she
“wasn’t feeling good that whole entire weekend.” Tr. 15. Petitioner stated that she “was sleeping
all weekend, which is nothing like [her].” Id. She explained that she is usually “out doing
something with [her] daughter or something with friends,” but “[a]ll [she] wanted to do was sleep.”
Id. at 15-16. At that time, she was working at Dunkin’ Donuts. Id. at 15. Petitioner stated that
she was sent home early from a shift at Dunkin’ Donuts “because [she] was having facial
numbness, blurriness, [and] headaches[; she] just wasn’t feeling good at all that weekend.” Id.
The timeline of these symptoms is somewhat uncertain, as Petitioner also agreed with her counsel
that these symptoms occurred “a few days before” and “in the middle of the week” before her
admission to Twin Cities Hospital on Monday, June 24, 2013. Id. at 16.

       Petitioner stated that she began working as a urology medical assistant only days before
she became ill. Tr. 12. She explained that she completed training at a doctor’s office on a Friday,
June 21, 2013, and returned the following Monday to begin working. Id. at 13. Petitioner
described the initial onset of her symptoms June 24, 2014 as follows:

5
  Respondent “agrees that [P]etitioner had more than six months of residual effects or
complications of her injury after vaccination.” Resp’t’s Rept. at 8, ECF No. 44.
6
    Petitioner testified that she now has two children, ages one and seven. Tr. 10-11.
                                                   6
        [T]hat morning, I started getting dizzy [and] I had a headache. So I kept going to
       the bathroom, splashing water on my face, trying to see if it was just anxiety or
       nerves from the first day of the actual job.
Id. Petitioner explained that the medical office was transitioning from paper charts to electronic
charts, so she was on a stepladder that morning moving boxes. Id. She described the progression
of her symptoms over that morning as follows:
       [W]hen I was up on the stepladder, my right foot started going numb, like it was
       going to sleep[,] and I kept trying to shake it off and just keep going. And then they
       bought us lunch because we were preparing for the new system. And when I sat
       down for lunch, my leg was still numb, but then my waist and abdomen started
       going numb, and I couldn’t see. I had blurry vision [and] a headache. And I was
       texting my mom and asking if this is normal or if it was anxiety.
Id. After being unable to eat anything at lunch, Petitioner testified that she “started walking back
towards [her] office and [she] had [her] hand on the wall because [her] legs were going numb and
[she] couldn’t walk properly.” Id. at 13-14. Petitioner recalled that a coworker told her that she
did not look well. Id. at 14. That coworker ultimately brought Petitioner to the hospital nearest
the office, Twin Cities Hospital. Id.

         Petitioner estimated that “the incident started” around 10:30 a.m. that morning, and that
she arrived at Twin Cities Hospital at “about 11:00” a.m. Tr. 14. Petitioner testified that “by the
time [she] got [to the hospital], [she] was completely paralyzed [and] couldn’t move.” Id. She
testified that she was admitted to the hospital and tests were completed. Id. Petitioner testified
that she was at Twin Cities Hospital until approximately midnight that night, when she was
transferred to Fort Walton Hospital. Id. at 14-15.

        At Fort Walton Hospital, Petitioner recalled being treated by Dr. Roman Kutsy and
describing her symptoms from the previous week to him. Tr. 15. Petitioner testified that providers
at Fort Walton Hospital “gave [her] an incorrect diagnosis,” and she was discharged on July 3,
2013. Id. at 15-16.

        Petitioner testified that about twelve hours after she was discharged from Fort Walton
Hospital, she went to Crestview Hospital because she was unable to urinate. Tr. 16. She testified
that she was catheterized at that hospital and diagnosed with a severe urinary tract infection. Id.
Petitioner stated that she was discharged with a catheter in place and was told to follow up with a
doctor for the urinary symptoms. Id.

        Petitioner testified that she “ended up back in the hospital by ambulance on July 10th,”
2013. Tr. 17. She explained that she “started out at Crestview Hospital,” where providers ran
numerous tests. Id. Petitioner testified that, based on “a blood test that c[a]me back . . . show[ing]
markers of something wrong,” she was transferred to Sacred Heart Hospital. Id. Petitioner
described that, by that time, her symptoms included “paralyzation[;] neurogenic bladder[;]
neurogenic bowels[;] pain in [her] back[;] numbness[;] tingling[;] fatigue[;] and all of that.” Id.
She recalled that Dr. George Dmytrenko, a neurologist at Sacred Heart Hospital, “did the MRI
with the contrast and found the lesion from T6 to T8 in [her] spine.” Id. at 17-18. She testified
that Dr. Dmytrenko diagnosed her with TM. Id.

                                                  7
        Petitioner explained that, “shortly after that,” she was released to the West Florida
Rehabilitation Center. Tr. 18. At the Rehabilitation Center, she was taught “how to live with the
transverse” myelitis. Id. This included training her how to self-catheterize, how to use a
wheelchair, how to walk with aids, and how to do exercises and therapy to gain muscle control.
Id. Petitioner testified that when she was released from the Rehabilitation Center, she “was still
in the wheelchair.” Id. at 18-19. She explained that she “could only probably walk about 200 feet
without falling or having an accident” at that time. Id. at 19. She estimated that it took “about a
year” to become fully independent of walking aids. Id. at 18-19.

        Petitioner testified that she still has neurogenic bladder and bowels, and still needs to self-
catheterize. Tr. 19. She stated that she has chronic fatigue, chronic migraines, “dizziness every
now and then, [and] neuropathy from the breast line down.” Id. She also testified that she does
not have sensitivity to hot or cold. Id. Additionally, Petitioner testified that she “still ha[s] muscle
spasms, which cause [her] to fall very frequently.” Id. Petitioner testified that she has also
developed hypothyroidism and a cyst on her brain. Id. at 20. She treats regularly with several
different doctors, including Dr. Nagrani for her hypothyroidism and frequent kidney infections;
Dr. Coates for obstetrics and gynecology; Dr. Mendez for primary care; and neurologist Dr.
Aubert, who monitors the cyst on her brain and treats the TM. Id.

        Petitioner testified that she will not be able to work in the future as a medical assistant
“because of [her] immune[e] system being compromised.” Tr. 19. Additionally, she is “a fall
risk” with chronic back pain. Id. Consequently, she cannot spend long hours on her feet or lift
patients. Id. She testified that she is not currently working. Id. at 10.

        III.   Expert Review

                       A. Petitioner’s Expert, Ahmet Höke, M.D., Ph.D, FRCPC

       Dr. Ahmet Höke (“Dr. Höke”) authored two expert reports in this case and testified at the
hearing. Pet’r Exs. 28, 50; Tr. 22-69, 153-57. Dr. Höke is currently a professor of neurology and
neuroscience at Johns Hopkins University School of Medicine. Pet’r Ex. 28 at 2; Pet’r Ex. 29 at
1. He testified that he is board-certified in neurology. Tr. 22. Dr. Höke testified that
approximately seventy percent of his time is spent on research, and the other twenty-five to thirty
percent is spent on clinical and administrative duties. Id. at 24-25.

       Dr. Höke testified that his research focuses on “peripheral nerve regeneration and
understanding mechanisms of peripheral neuropathies.” Tr. 23. Dr. Höke estimated that he has
published more than 140 papers. Id.; see Pet’r Ex. 29 at 2-11. Although he has “not specifically
published research articles on transverse myelitis,” he has written book chapters on related
autoimmune peripheral neuropathies, specifically GBS and Chronic Inflammatory demyelinating
Polyneuropathy (“CIDP”). Pet’r Ex. 28 at 2.

        Dr. Höke’s clinical practice is limited to patients with peripheral neuropathies. Pet’r Ex.
28 at 2. Dr. Höke testified that he sees “probably a couple hundred patients a year” in clinic at
Johns Hopkins, most of whom are peripheral neuropathy patients. Tr. 23-24. He explained that

                                                   8
he “see[s] a fair amount of patients with either acute GBS or GBS patients who are not recovering
from their GBS[, as well as] many patients with CIDP.” Pet’r Ex. 28 at 2. He also “attend[s] on
the inpatient general neurology ward service one month [per] year where [he] see[s] and manage[s]
patients with [TM].” Id. Dr. Höke explained that Johns Hopkins has “a specialized center for
[TM],” so there are “quite a few inpatients.” Tr. 24. He estimated that he has “managed more
than 40 patients with [TM].” Pet’r Ex. 28 at 3.

        Dr. Höke testified that he “[r]arely” participates in legal medical cases. Tr. 25. He stated
that he has participated in twenty-two cases in the vaccine program in the last twelve or thirteen
years, with his participation in nineteen of those cases being for a petitioner. Id. Dr. Höke also
stated that he has testified in Vaccine Program cases on two occasions; once for a petitioner and
once for Respondent. Id.; Pet’r Ex. 28 at 3. Dr. Höke was admitted to offer expert testimony at
the hearing in the area of neuromuscular neuroscience. Tr. 26.

                               i.   Dr. Höke’s First Report

        Dr. Höke’s first expert report was authored on August 2, 2015. Pet’r Ex. 28. In preparation
for the report, Dr. Höke reviewed Petitioner Exhibits 1-27. Id. at 1-2. He began his report with a
brief review of Petitioner’s medical records. Id. at 3-4. His review is generally consistent with
the exhibits in the record beginning June 24, 2013. Id. Notably, Dr. Höke did not reference any
symptoms occurring prior to June 24, 2013 that he associated with Petitioner’s TM. See id.
Additionally, Dr. Höke wrote that he would discuss Petitioner’s diagnoses and “possible
relationship to the hepatitis B vaccinations she had on 10/15/2012 and 04/18/2013,” so it is unclear
whether Dr. Höke was aware of the additional Hep B vaccination in November 2012. Id. at 3.

        After summarizing Petitioner’s medical records, Dr. Höke opined that the records “clearly
indicate[] that [Petitioner] had an acute episode of myelitis.” Pet’r Ex. 28 at 4. He notes that her
presentation of “upper abdominal pain associated with rapidly evolving weakness in the lower
extremities, a thoracic sensory level[,] and bowel and bladder dysfunction are almost textbook
classic for [TM].” Id. He acknowledges that the diagnosis was initially unclear, but that it was
confirmed with MRI imaging, which showed a lesion “at the appropriate level (T6-T8).” Id.

        Dr. Höke described idiopathic TM as “an inflammatory disease affecting the spinal cord.”
Pet’r Ex. 28 at 4 (citing Pet’r Ex. 347). He explained that “[s]ymptoms and examination findings
vary depending on the level and the extent of inflammation,” but they generally involve a
combination of motor pathways, sensory fibers, and autonomic dysfunction. Id. at 4-5. He wrote
that “case series [have] show[n] close association between infections and/or vaccinations and
[TM].” Id. at 5. Dr. Höke noted that “[d]ifferential diagnoses include[:] demyelinating diseases
of the central nervous system, such as multiple sclerosis [ ], neuromyelitis optica[,] and idiopathic

7
 Bruce A. C. Cree, Acute Inflammatory Myelopathies, Multiple Sclerosis and Related Disorders
613 (Douglas S. Goodin, ed., 3d Series, 2014).

                                                 9
[TM;] infections[,] such as herpes viruses or tuberculosis[;] and other inflammatory diseases[,]
such as neurosarcoidosis or systemic lupus erythematosus.” Id. at 4 (citing Pet’r Ex. 358).

        Dr. Höke summarized two papers where different authors studied a potential relationship
between vaccines and TM. Pet’r Ex. 28 at 5. He first discussed one paper from 2009, wherein the
authors, Agmon-Levin, et al., conducted a “large multi-analysis review of the literature” to identify
“reported cases of [TM] which were temporally associated with various vaccines.” Id. (citing Pet’r
Ex. 309). Dr. Höke wrote that, in that study, the authors identified thirty-seven reported cases of
TM which were temporally associated with several vaccines, including vaccines for Hep B. Id.
Dr. Höke noted that “[i]n most cases[,] the onset was from a few days to 3 months.” Id. Dr. Höke
then referenced another paper, from 2001, which he called “one of the strongest case series that
showed a close temporal relationship between [the] Hep[] B vaccine and acute [TM].” Id. (citing
Pet’r Ex. 3610). Dr. Höke summarized that the authors of that paper, Karaali-Savrun, et al.,
identified four cases of acute TM which developed after the patients received a Hep B vaccination.
Id. He noted that three of the patients developed symptoms within three to four weeks of
vaccination, but the fourth patient “developed neurological symptoms about 3 months after the
third dose” of the vaccine. Id.

         Dr. Höke wrote that “[t]he pathogenic mechanism of acute [TM] is not exactly known[,]
but it is thought to be an autoimmune phenomenon related to [a] molecular mimicry hypothesis.”
Pet’r Ex. 28 at 5 (citing Pet’r Ex. 3311). Dr. Höke cited to a 2004 paper where the authors,
Krishnan, et al., discussed the “more established link between molecular mimicry and another
monophasic autoimmune neurological disorder, Guillain-Barre syndrome, a demyelinating disease
affecting the peripheral nerves.” Id. (citing Pet’r Ex. 3712). He explained that the authors of that
paper pointed to other research which showed “that in [TM,] molecular mimicry may activate T-
cell based autoimmunity [ ] or stimulate generation of auto-antigens [ ] that result in immune

8
 Anu Jacob & Brian G. Weinshenker, An Approach to the Diagnosis of Acute Transverse Myelitis,
28 SEMINARS IN NEUROLOGY 105 (2008).
9
 N. Agmon-Levin, S. Kivity, M. Szyper-Kravitz & Y. Shoenfeld, Transverse Myelitis and
Vaccines: A Multi-Analysis, 18 LUPUS 1198 (2009).
10
   F. Karaali-Savrun, A. Altintas, S. Saip & A. Siva, Hepatitis B Vaccine Related-Myelitis?, EUR.
J. OF NEUROLOGY 711 (2001).
11
  Amer Awad & Olaf Stüve, Idiopathic Transverse Myelitis and Neuromyelitis Optica: Clinical
Profiles, Pathophysiology and Therapeutic Choices, 9 CURRENT NEUROPHARMACOLOGY 417
(2011).
12
  Chitra Krishnan, Adam I. Kaplin, Deepa M. Deshpande, Carlos A. Pardo & Douglas A. Kerr,
Transverse Myelitis: Pathogenesis, Diagnosis and Treatment, 9 FRONTIERS IN BIOSCIENCE 1483
(2004).
                                                 10
complex formation and activation of cell- or complement[-] mediated self[-]injury to neural
tissues.” Id. (citing Pet’r Exs. 38,13 39,14 4215).

        Dr. Höke then explained that “[t]he issue of molecular mimicry is amplified when both B-
cells (via the antibodies they produce) and auto-reactive T cells act in concert.” Pet’r Ex. 28 at 5.
He wrote that “T-cell receptors can recognize a broad range of epitopes.” Id. Therefore, Dr. Höke
explained that it is “even easier for T-cell receptors to be activated by cross-reactivity with epitopes
found on infectious agents or vaccine components derived from the infectious agents” when major
histocompatibility complex binding motifs are degenerated. Id. Dr. Höke wrote that “[e]xamples
of molecular mimicry in neurological disease with auto-reactive T-cells include establishment of
a rabbit model of multiple sclerosis using hepatitis B virus polymerase peptide.” Id. He also noted
that “[s]imilar examples for other autoimmune disorders also exist (e.g. experimental anti-
phospholipid syndrome).” Id.

       Dr. Höke wrote that “[i]t is generally accepted that in order to elicit an autoimmune
response, the infection or vaccine has to be closely temporally associated and precede the
neurological event by a few days to 6-8 weeks.” Pet’r Ex. 28 at 5. That timeline is “based on the
observation that it takes [a] few days to generate antibodies against components of an infectious
agent (in B-cell mediated autoimmunity) or create autoreactive T-cells (in T-cell based
autoimmunity).” Id. Citing a book chapter available on the World Health Organization’s website,
Dr. Höke wrote that “the initial response to vaccine starts within days and peaks around four
weeks.” Id. at 6 (citing Resp’t Ex. I16 at 9, Figure 2.3). Therefore, Dr. Höke concludes that “the
onset of [Petitioner’s] neurological symptoms about 2 months after her second [sic] hepatitis B
vaccine would fit into a proper immune response timeframe.” Pet’r Ex. 28 at 6.

        Dr. Höke concluded that be “believe[s] [Petitioner] developed acute [TM] most likely as a
consequence of her Hep[] B vaccination.” Pet’r Ex. 28 at 6. He emphasized that Petitioner’s
clinical presentation, MRI results, and clinical course upon discharge support the diagnosis of TM.
Id. He wrote that the “[c]lose temporal relationship between her vaccination and development of

13
  Michael C. Levin, Sang Min Lee, Franck Kalume, Yvette Morcos, F. Curtis Donhan Jr, Karen
A. Hasty, Joseph C. Callaway, Joseph Zunt, Dominic M. Desiderio & John M. Stuart,
Autoimmunity Due to Molecular Mimicry as a Cause of Neurological Disease, 8 NATURE MED.
509 (2002).
14
  Julie K. Olson, Todd N. Eagar & Stephen D. Miller, Functional Activation of Myelin-Specific T
Cells by Virus-Induced Molecular Mimicry, 169 J. OF IMMUNOLOGY 2719 (2002).
15
  R. Anthony Williamson, Mark P. Burgoon, Gregory P. Owens, Omar Ghausi, Estelle Leclerc,
Louise Firme, Sharon Carlson, John Corboy, Paul W. H. I. Parren, Pietro P. Sanna, Donald H.
Gilden & Dennis R. Burton, Anti-DNA Antibodies are a Major Component of the Intrathecal B
Cell Response in Multiple Sclerosis, 98 PNAS 1793 (2001).
16
   Claire-Anne Siegrist, Vaccine Immunology, in PLOTKIN’S VACCINES 16 (7th ed. 2018).
Although Dr. Höke only provided a link to this chapter in his expert report, Respondent filed the
document after the hearing.
                                                  11
[TM], previous case reports, and the ‘molecular mimicry’ hypothesis make it very likely that her
[TM] is due to the Hep[] B vaccination.” Id.

                              ii.   Dr. Höke’s Second Report

        Dr. Höke’s second expert report was authored on July 4, 2016. Pet’r Ex. 50. In preparation
of his second report, Dr. Höke reviewed Respondent’s expert’s report, Respondent’s expert’s CV,
and the medical literature filed by Respondent. Id. at 1. Dr. Höke opined in his second report that
he and Respondent’s expert agree on the diagnosis of TM. Id. He concluded that the
“disagreement seems to center around the issue of causality with relation to [Petitioner’s]
vaccination with [the] Hep[] B vaccine.” Id.

        Dr. Höke acknowledged that case reports and aggregate reports “do not establish a direct
causality.” Pet’r Ex. 50 at 1. However, Dr. Höke wrote that for “rare diseases such as [TM],
establishment of a direct link with a risk factor is not straightforward.” Id. Additionally, “in many
instances[,] [direct causality] has not been studied in detail.” Id. Dr. Höke wrote that “[d]espite
their many faults, case reports do teach us about a potential association between a risk factor and
a disease.” Id. Dr. Höke noted that “in a given patient[,] it would be difficult to ascertain with
100% certainty that a given risk factor is not causally linked to the disease phenotype.” Id.

        Dr. Höke wrote that, after he authored his first report, a new case report was published
which “potentially link[s]” the Hep B vaccine and neuromyelitis optica (“NMO”). Pet’r Ex. 50 at
1 (citing Pet’r Ex. 5217). He describes NMO as “a disease that is a combination of [TM] and optic
neuritis.” Id. He also referenced four additional case reports, not cited in his first report, which
“show a potential association between [the Hep B vaccine] and demyelinating diseases of the
central nervous system.” Id. at 2 (citing Pet’r Exs. 54,18 55,19 57,20 6021).

17
   Richard Heekin, Chetan Gandhy & Derrick Robertson, Seronegative Neuromyelitis Optica
Spectrum Disorder Following Exposure to Hepatitis B Vaccination, 7 CASE REP. NEUROLOGY 78
(2015).
18
  Owen Stewart, Bernard Chang & John Bradbury, Simultaneous Administration of Hepatitis B
and Polio Vaccines Associated with Bilateral Optic Neuritis, 83 BRIT. J. OPHTHALMOLOGY 1200
(1999).
19
  Lisa M. Tartaglino, Terry Heiman-Patterson, David P. Friedman & Adam E. Flanders, MR
Imaging in a Case of Postvaccination Myelitis, 16 AM. J. NEURORADIOLOGY 581 (1995).
20
 Vesna V. Brinar & Charles M. Poser, Disseminated Encephalomyelitis in Adults, 110 CLINICAL
NEUROLOGY & NEUROSURGERY 913 (2008).
21
  Franco Trevisani, Guido Castelli Gattinara, Paolo Caraceni, Mauro Bernardi, Francesco
Albertoni, Roberto D’Alessandro, Luigi Elia & Giovanni Gasbarrini, Transverse Myelitis
Following Hepatitis B Vaccination, 19 J. HEPATOLOGY 317 (1993).
                                                 12
        Dr. Höke also disagreed with several “summary statements” referenced in Respondent’s
expert’s report which are quotes from the National Multiple Sclerosis (“MS”) Society and the
Institute of Medicine related to the risk of MS after the Hep B vaccine. Pet’r Ex. 50 at 2 (referring
to Resp’t Ex. A at 4-5). Dr. Höke explained that MS is “a more common demyelinating disease
of the central nervous system.” Id. Dr. Höke wrote that a systematic review of the literature,
which was completed more recently than when the quoted statements were made by the National
MS Society and the Institute of Medicine, reveals a connection between the Hep B vaccine and
MS. Id. (citing Pet’r Ex. 5922). He explained that “although several studies did not show an
increased risk for development of demyelinating disease with [the Hep B vaccine], one prospective
study clearly showed a 3.1 fold increase in development of MS in patients who received” the Hep
B vaccine. Id. (citing Pet’r Ex. 5823). Dr. Höke wrote that the study “was based on looking at the
incidence of MS in the General Practice Research Database (GPRD) in Britain,” which consists of
“over 3 million patients.” Id. The study then “compar[ed] the characteristics of patients diagnosed
with MS and controls,” and Dr. Höke noted that “10 control cases were reviewed for each MS
diagnosis.” Id. Dr. Höke wrote that “[t]he analysis showed that patients in the general population
were 3.1 times more likely to have developed MS if they received [the Hep B vaccine] within 3
years of the onset of their MS.” Id. Thus, Dr. Höke explained that “the link between [the Hep B
vaccine] and demyelinating diseases of the central nervous system is not straightforward and the
potential link has not been conclusively demonstrated not to exist.” Id.

       In conclusion, Dr. Höke wrote that “although there may not be [ ] direct conclusive
epidemiological data to link [the] [H]ep[] B vaccine to [TM], several studies do show a link
between [the] [H]ep[] B vaccine and other demyelinating diseases of the central nervous system.”
Pet’r Ex. 50 at 2. Therefore, he concluded that, “given a theoretical framework for molecular
mimicry and autoimmunity, one cannot be sure if there is no causative link between the two.” Id.

                              iii.   Dr. Höke’s Testimony

        Dr. Höke stated that TM is a “relatively rare disorder,” and explained that patients with
TM “may experience a variety of symptoms depending on whether the motor or sensory pathways
are affected, as well as bowel and bladder dysfunction.” Tr. 27-28. He testified that although the
medical community does not know exactly why TM occurs in some patients, the “underlying
process is thought to be an autoimmune attack on the myelin component of the central nervous
system with an inflammation that results in neurological dysfunction.” Id. at 28. Dr. Höke
explained that diagnosis of TM is made through clinical presentation, neurological examination,
imaging studies, and sometimes spinal fluid analysis. Id. at 30. Dr. Höke explained that TM “is
considered to be a monophasic illness,” where the patient suffers “only one attack.” Id. at 28-29.
In contrast, related diseases like MS are thought to be relapsing and remitting, with multiple lesions
separated by space and time. Id. at 29.

22
  V. Martínez-Sernández & A. Figueiras, Central Nervous System Demyelinating Diseases and
Recombinant Hepatitis B Vaccination: A Critical Systemic Review of Scientific Production, 260 J.
NEUROLOGY 1951 (2013).
23
  Miguel A. Hernán, Susan S. Jick, Michael J. Olek & Hershel Jick, Recombinant Hepatitis B
Vaccine and the Risk of Multiple Sclerosis: A Prospective Study, 63 NEUROLOGY 838 (2004).
                                                 13
         Dr. Höke testified that “autoimmune diseases, especially the demyelinating autoimmune
diseases of the central nervous system[,] are more common among women.” Tr. 29. Additionally,
he testified that demyelinating disorders are most common in women in their twenties and thirties.
Id. at 30. He testified that certain infections can also cause TM. Id. at 29. In fact, Dr. Höke
testified that “the risk of developing [TM] is probably higher with the actual infection [of Hep B]
than with the vaccination.” Id. at 49.

       Dr. Höke testified that in the “literature on many autoimmune diseases[,] the primary
hypothesis is that there is a molecular mimicry between the antigen that incites the initial antibody
response, as well as another component within the person’s body.” Tr. 32. He noted that this
could happen “in the nervous system or any other tissue,” where “there is a homology that creates
an opportunity for the antibody to go and attack [a person’s] own proteins or lipids or sugar moiety
and their tissues.” Id. Dr. Höke testified that for molecular mimicry to occur, there must be an
“antibody presence or active T cells.” Id. at 36.

        Dr. Höke testified that, in the medical community in general, molecular mimicry is
considered to be a biologically plausible mechanism for demyelinating disorders. Tr. 33. He
further testified that molecular mimicry is “considered a hypothesis that is well supported by the
experimental models, mostly in the peripheral nervous system, but also in the central
demyelinating diseases.” Id. Dr. Höke acknowledged that the literature underlying his molecular
mimicry hypothesis primarily involves GBS. Id. at 32. Dr. Höke explained that GBS is “a disease
of the peripheral nerves,” and patients sometimes have “symptoms very similar to [TM].” Id. at
64. Dr. Höke explained that GBS is “probably the most well studied experimentally of all
autoimmune diseases of the nervous system.” Id. at 63. He testified that there are “very good
animal models” relating to GBS, and “the molecular mimicry hypothesis was really proven within
the GBS literature.” Id. This is because the medical community “know[s] exactly what the inciting
factor is and how it corresponds to a similar molecule on the nervous tissue.” Id. at 32-33; see
also id. at 63. Therefore, Dr. Höke explained that with GBS, medical experts know how the
identified antibody “makes [a] mistake and goes and attacks a corresponding molecule on the
nervous tissue.” Id. at 63. Dr. Höke testified that in MS and TM, the hypothesis is that “there is
a similar process,” but medical experts “just don’t know what that protein is[,] or lipid is[,] or sugar
moiety is.” Id. He testified that although GBS affects the peripheral nervous system and TM
affects the central nervous system, an autoimmune reaction resulting from a vaccine would occur
in the same way. Id. at 64.

        Dr. Höke explained that when a vaccine is administered, it causes an antibody response
against the antigen that is present in the vaccine, which helps prevent future infections. Tr. 27.
The Hep B vaccine, therefore, is designed to prevent development of a hepatitis B infection by
causing an antibody response similar to that which would occur with such an infection. Id. Dr.
Höke explained that in some patients, “in the appropriate environment with the antibody response,
those antibodies can get access to the spinal cord and cause [TM].” Id. at 32.

       Dr. Höke noted that the development of TM is “obviously not just due to the vaccine[,]
[because] [o]therwise, we would be seeing [TM] in every patient.” Tr. 32. Dr. Höke opined that,
“especially for [central nervous system] demyelinating diseases, there is probably a secondary

                                                  14
event that triggers the access of those antibodies to the central nervous system to induce the
neurological damage.” Id. at 36. Although he noted that “often, especially for [central nervous
system] diseases, there [has] to be a secondary insult,” he conceded that the medical community
has not pinpointed that secondary insult. Id. at 46. Dr. Höke explained that “[t]here has to be [an]
opening of the blood-brain barrier to allow access of the antibodies to -- or the cells -- inflammatory
cells to access the central nervous system to induce the demyelination.” Id. He testified that the
secondary insult could be “a trauma,” or it could be that “some people’s genetic makeup makes
their blood-brain barrier more leaky.” Id. at 46-47.

       Dr. Höke specifically discussed several published papers cited by himself and
Respondent’s expert which address a potential connection between Hep B and TM. Dr. Höke
acknowledged that some of the studies he referenced looked at patients who received the Hep B
vaccine in combination with other vaccines. Tr. 53. He conceded that the presence of another
vaccine in a studied patient could mean that the Hep B vaccine did not cause the reaction which
was studied. Id. at 51-52.

        He explained that the Karaali-Savrun paper is a case report reflecting “four cases of [TM]
after [H]ep[] B vaccination,” where patients with “no other risk factors . . . developed [TM] soon
after receiving the [H]ep[] B vaccine.” Tr. 34; Pet’r Ex. 36. He noted that the authors of that paper
“put forth the hypothesis that [the findings] could be due to the molecular mimicry mechanism.”
Tr. 34.

       Dr. Höke also described the Agmon-Levin paper. Pet’r Ex. 30. He testified that it
represents “a broader summary of reviewing the literature and putting together all the case reports,”
where thirty-nine cases of TM occurring after a hepatitis B infection were reviewed. Tr. 34.

         Dr. Höke opined that the 2004 Hernán paper “was really well done.” Tr. 34; Pet’r Ex. 58.
He testified that the paper looked at the incidence of MS after Hep B vaccine in the general
population, using data from general practice. Tr. 34. Dr. Höke described the process of the
“prospective nested case control study,” which “looked at over 3,000 patients and identified
several hundred MS patients [and then] compared them to controls.” Id. at 34-35. Dr. Höke
testified that “[f]or each indexed patient with [MS], [the researchers] identified at least ten cases
without MS, and then looked at their risk factors.” Id. at 35. Dr. Höke explained that the
researchers initially hypothesized “that if [a patient] had vaccinated with hepatitis B in the previous
three years, their incidence of MS [would be] higher.” Id. He testified that the research showed
“a threefold increase in incidence.” Id.

       Dr. Höke also discussed the Shaw paper, which was cited by Respondent’s expert. Tr. 39;
Resp’t Ex. C.24 Although the paper, which was based on a study of VAERS data, did not find an
increased risk for MS after Hep B vaccination, Dr. Höke testified that “VAERS is notorious for

24
  Frederic E. Shaw, Jr., David J. Graham, Harry A. Guess, Julie B. Milstein, Joyce M. Johnson,
Gary c. Schatz, Stephen C. Hadler, Joel N. Kuritsky, Elizabeth E. Hiner, Dennis J. Bregman &
James E. Maynard, Postmarketing Surveillance for Neurologic Adverse Events Reported After
Hepatitis B Vaccination, 127 AM. J. EPIDEMIOLOGY 337 (1988).

                                                  15
underreporting.” Tr. 39. Therefore, he testified, finding an epidemiological association based on
VAERS reports “is going to be difficult.” Id. Dr. Höke’s believes that the 2004 Hernán paper,
cited by him, is “a much stronger paper.” Id. at 40. Dr. Höke testified that he was unaware that
Hernán authored a second paper in 2006. Id. at 55-56; see Resp’t Ex. J.25

         Dr. Höke testified that he does not believe that Respondent’s expert disagrees “about
whether molecular mimicry can be a mechanism for autoimmunity.” Tr. 38. Instead, Dr. Höke
opined that “the disagreement stems from the timing of the process.” Id. Dr. Höke initially
testified that “usually[,] the antibody production peaks around two to four weeks.” Id. at 35.
Referring to the period of time where a patient is at risk of developing an autoimmune response,
Dr. Höke also testified that “we generally consider [a period of] four weeks or eight weeks.” Id.
at 62. He also testified that experts “generally accept 8 weeks -- 8 to 12 weeks as a standard period
where you can see autoimmunity because that’s the peak of the autoimmune response.” Id. at 37.
Dr. Höke acknowledged that some of the studies that he referenced in support of his theory
discussed symptoms that started within a month of vaccination. Id. at 49-50.

        Dr. Höke agreed that “for policy purposes, we may need to create some sort of a cutoff,”
but he opined that “eight weeks is too stringent.” Tr. 65. Dr. Höke testified that in “broad
population-based studies, [researchers are] always looking at the majority of the patients.” Id. at
38. He explained that “the peak is when the majority of patients are going to present[,] [b]ut there
are always individual patients who will probably fall outside that range.” Id. at 65. He explained
that there is often “going to be a two standard deviation [range] that [is] the statistically accepted
norm,” but “there [are] going to be patients who are beyond that.” Id. at 51; see also id. at 38-39.
In other words, although the studies must create a cutoff date between “when the risk is high and
when the risk is low,” it is “an artificial cutoff.” Id. at 39, 61-62. He explained that, for any given
individual patient, it is difficult to apply such a stark cutoff, “especially when the dates are so close
to each other.” Id. at 39. For example, “if the cutoff is 60 days . . . and you have somebody who
probably had similar levels of antibodies on Day 62[,] [that person] could easily have developed
[TM] within that time frame.” Id. at 42. Dr. Höke opined that “when you’re taking care of [any
individual patient,] there are so many other variables that may not be obvious in an epidemiological
study.” Id. at 40. He explained that, “in some people, the immune response is really hyperactive
and it can present very, very rapidly.” Id. at 65. However, in other people, “it may take a lot
longer,” he explained. Id. He testified that he believes “it’s luck” that determines when a patient
has a reaction. Id. at 65-66. Dr. Höke emphasized that “human biology is not like a mechanical
event where you have a clear cutoff between one event and another. Some people’s bodies just
react differently.” Id. at 68. He explained that “we just don’t know” why the antibody response
happens when it does in any specific patient. Id. at 66.

        Additionally, Dr. Höke emphasized that even after the antibody response peaks, “it will
taper down[,] [b]ut it doesn’t go away.” Id. at 35. He stated that “as long as you have high levels
of circulating antibodies, that process [of molecular mimicry] can happen [at] any time.” Id. at 36.
Dr. Höke opined that it is “naïve to think that you could have autoimmunity up to week 8, but then
one day later, you can’t have autoimmunity,” even though “your antibody titers are probably the

25
   Miguel A. Hernán & Susan S. Jick, Hepatitis B Vaccination and Multiple Sclerosis: The Jury is
Still Out, 15 PHARMACOEPIDEMIOLOGY & DRUG SAFETY 653 (2006).
                                                   16
same.” Id. at 37. He testified that there is an “elevated risk for a much longer period of time,” and
that “antibody levels don’t trail off or fall off the cliff” on a particular date. Id. at 43-44. Dr. Höke
emphasized that “antibodies don’t go away on day 61[;] [the antibody level] still remains
elevated.” Id. at 38. Dr. Höke testified that the titer levels are “exponentially higher” than a
patient’s baseline level, even four months after vaccination. Id. at 66. He elaborated that “there’s
probably not a significant difference between four weeks and 16 weeks.” Id. at 67.

         Dr. Höke testified that in one study, researchers found that “the levels of the antibody
response among patients who received [a] [H]ep B vaccine” were not statistically significantly
different between weeks eight and sixteen. Tr. 35-36; Resp’t Ex. H at 4.26 He testified that even
at week sixteen, “the antibody levels were profoundly elevated compared to [the level measured]
before [the patients] received the [H]ep B vaccine.” Tr. 36. He noted that the researchers did not
measure the levels after sixteen weeks. Id. Additionally, Dr. Höke testified that levels remain
elevated for months. Id. at 43. Dr. Höke also testified that the World Health Organization “usually
cites a period of two to three months for the onset of neurological disease,” citing the Karaali-
Savrun paper. Id.; Pet’r Ex. 36 at 4. He also noted that the Hernán paper discussed studies where
MS was not present within one year after vaccination, but within two years it developed at
increased ratios when compared with non-vaccinated patients. Tr. 43-44; Pet’r Ex. 58. Referring
to Figure 2.3 in the Siegrist article, Dr. Höke testified that, after the first dose of a vaccine, the
antibody response rises and then comes back down fairly quickly. Tr. 58; Resp’t Ex. I at 9, Figure
2.3. After a booster vaccination, he testified that the antibody response rises “higher than the initial
level” and then remains higher than baseline for an extended period of time. Tr. 59. Dr. Höke
explained that after the peak immune response after a booster vaccination, the data “clearly shows
that [a patient has] very high levels of antibody response six months out and even much longer
. . . with certain vaccinations.” Id. at 54; Resp’t Ex. I at 9, Figure 2.3. Dr. Höke testified that “the
reason we do it [give booster vaccinations] is [a person] get[s] an antibody response that lasts for
years.” Tr. 54. He testified that “as long as there [are] elevated antibody levels in the blood, [a
patient is] going to be at risk.” Id. at 46.

        Dr. Höke testified that the Baxter paper27 was “not specifically addressing [H]ep B and TM
or [H]ep B and MS.” Tr. 153. Instead, he explained that the study involved “a whole compilation
of vaccines.” Id. Although Dr. Höke opined that the study “is a fairly well done study because it
looks at a very large patient population,” he noted that the validity of the study relies on the codes
entered by physicians. Id. at 154. Dr. Höke explained that the study only considered diagnostic
codes for idiopathic TM and ADEM, which would potentially miss patients who presented with
milder symptoms, such as “numbness or maybe paresis and not clear-cut [TM].” Id. It would also

26
   Mohammad Reza Sam, Mohammad Ali Shokrgozar & Fazel Shokri, Longitudinal
Determination of Hepatitis B surface Antigen-Specific B Lymphocyte Frequency in Healthy High
Responder Adults After Booster Vaccination, 51 INTERVIROLOGY 87 (2008).
27
   The Baxter paper, Respondent Exhibit L, was introduced during Respondent’s expert’s
testimony, and Dr. Höke addressed it when recalled. Roger Baxter, Edwin Lewis, Kristin
Goddard, Bruce Fireman, Nandini Bakshi, Frank DeStefano, Julianne Gee, Hung Fu Tseng,
Allison L. Naleway & Nicola P. Klein, Acute Demyelinating Events Following Vaccines: A Case-
Centered Analysis, 63 CLINICAL INFECTIOUS DISEASES 1456 (2016).
                                                   17
potentially exclude patients such as Petitioner, whose diagnosis “was missed for a long time.” Id.
at 155.

        Dr. Höke testified that Petitioner “was a previously healthy person [and] had no other
neurological illness.” Tr. 37-38. He also noted that she did not have “evidence of prior infection,
which could trigger transverse myelitis.” Id. at 38. Dr. Höke testified that Petitioner’s symptoms
and imaging studies were consistent with TM, so “there [was] really nothing else in the differential
diagnosis.” Id. Dr. Höke explained that Petitioner had an “aberrant response” to the Hep B
vaccine, which he “suspect[s] [was due to] a combination of [Petitioner’s] genetic makeup or other
risk factors.” Id. at 32.

        Dr. Höke testified that Petitioner is “the appropriate gender and age group,” and that
Petitioner’s age group and gender “put[] her at high risk.” Tr. 38, 44-45. He further testified that
Petitioner had a vaccination which “case reports have shown [creates] an increased risk.” Id. at
44-45. Therefore, in summary, Dr. Höke testified that Petitioner developed TM after receiving the
Hep B vaccination because she was the “appropriate gender [and] age group, [had a] lack of any
other risk factors, and [was] vaccinat[ed] with a vaccine that is known to be associated with
. . . MS, which is a related disorder to [TM].” Id. at 60. Dr. Höke conceded that, if Petitioner had
not received the Hep B vaccine, he would characterize her TM as idiopathic. Id. at 61. Dr. Höke
acknowledged that none of Petitioner’s treating physicians documented that they thought the Hep
B vaccine may have caused Petitioner’s TM. Id. at 48. However, Dr. Höke opined that “it really
does [not] surprise [him],” because “a lot of physicians are not even aware of the adverse reporting
system.” Id. Thus, he testified that he believes it is more likely than not that the Hep B vaccine
can cause a demyelinating disorder, and that it caused TM in Petitioner’s case. Id. at 44, 45.

        Dr. Höke testified that Petitioner’s development of weakness and numbness while at work
on June 24, 2013 “are the classical signs” of TM. Tr. 41. He opined that “the demyelination
probably matured enough to cause the weakness around the day when she was admitted to the
hospital.” Id. Dr. Höke also discussed Petitioner’s report of sensory symptoms, including “fatigue
and some vague numbness [and] tingling” five days before her initial hospitalization. Id. He
opined that “[i]t’s possible” that those symptoms were the initial indications of her illness. Id. He
explained that patients with TM often describe sensory symptoms, and that “fatigue is also a
relatively common symptom that patients describe.” Id. Dr. Höke noted that patients often “just
don’t feel like themselves and sometimes they can’t even pinpoint it.” Id. He contrasted a
demyelinating illness like TM with a “very acute event” such as a stroke, where a patient develops
symptoms immediately. Id. at 42. Dr. Höke explained that it “take[s] some time for the initial
insult to start and for the inflammation to mature and cause significant demyelination to result in
the weakness.” Id. Therefore, Dr. Höke testified that the disease process began “probably
somewhere around the time when she started to experience the tingling and numbness . . . five
days before she had the paralysis.” Id. Consequently, Dr. Höke opined that Petitioner’s TM began
sixty-two days after the administration of the Hep B vaccine, or June 19, 2013. Id. at 42-43. Dr.
Höke acknowledged that “we don’t know what the levels [of antibodies] are in her blood
specifically.” Id. at 60. However, “based on the published data, there’s going to be very similar
levels of antibodies in her blood at six weeks, eight weeks[,] or ten weeks” post-vaccination. Id.
at 61. Dr. Höke testified that, given the medical literature and his testimony that antibody levels

                                                 18
do not sharply drop off on a particular date, he believes that the timing of Petitioner’s symptom
onset is medically appropriate to attribute her development of TM to the Hep B vaccine. Id. at 43.

        Dr. Höke testified that he does not attribute any significance to the fact that the vaccine
Petitioner alleges caused her TM was the third Hep B vaccine she received. Tr. 46. He testified
that he is “not aware of any data to suggest that there [is] actually an increased risk for . . . [an]
autoimmune process . . . after repeated challenges.” Id. at 47. Dr. Höke also referenced a “very
famous case from Australia,” the authors of which he could not recall, about the influenza vaccine
and its relationship with GBS. Id. at 48. He explained that the subject of that study received the
influenza vaccine on three occasions over twelve years. Id. After each administration, the man
suffered from GBS. Id. However, Dr. Höke testified that he did not remember whether the second
or third reactions “happened faster after the vaccinations” than the first. Id.

                        B. Respondent’s Expert, Timothy Vartanian, M.D., Ph.D

         Dr. Timothy Vartanian (“Dr. Vartanian”) authored one expert report in this case and
testified at the hearing. Resp’t Ex. A; Tr. 70-152. Dr. Vartanian is currently an attending
neurologist at New York Hospital and a professor at Weill Cornell Medical College. Resp’t Ex.
B at 2; Tr. 70-71. He is board certified in neurology. Resp’t Ex. A at 1; Tr. 72.

         Dr. Vartanian estimated that eighty percent of his time is spent on research. Tr. 72. He
testified that his recent research includes studying how demyelinating lesions initially form in the
central nervous system. Id. at 73. That research includes researching infectious causes of lesion
genesis, as well as how immunity causes demyelination in the central nervous system. Id. The
research also includes studying treatments that will promote regeneration. Id. at 73-74.

        Dr. Vartanian testified that his “clinical effort is technically around 10 percent [of his time],
but that varies depending on . . . patient load and severity of cases.” Tr. 72. Dr. Vartanian testified
that the patients he sees are “[a]lmost exclusively multiple sclerosis, neuromyelitis optica . . . and
transverse myelitis” patients, or patients coming for second or third opinions from other facilities.
Id. at 73.

       Dr. Vartanian stated that five percent of his time is spent teaching, and the remaining five
percent is spent on administrative tasks. Tr. 72.

       Dr. Vartanian testified that he has authored approximately fifteen expert reports in the
Vaccine Program and has testified on one occasion. Tr. 74-75. He stated that his work in the
Program has been exclusively for the Department of Health and Human Services. Id. at 75. Dr.
Vartanian was accepted as an expert witness in the field of neurology and demyelinating diseases.
Id.

                                                   19
                                i.   Dr. Vartanian’s Report

        Dr. Vartanian authored his report on February 8, 2016. Resp’t Ex. A. Dr. Vartanian noted
that Petitioner received Hep B vaccinations on October 15, 2012 and April 18, 2013.28 Id. at 2.
He wrote that he “agree[s] with the diagnosis of acute [TM]” based on his “review of the clinical
presentation, neurologic exams, and the neuroimaging.” Id. Dr. Vartanian explained that
Petitioner “developed weakness in her legs and what sounds like a fairly obvious sensory level”
on June 24, 2013, but “[u]nfortunately, the diagnosis was missed.” Id. He noted that she was
diagnosed with TM on July 10, 2013. Id. He opined that the “unfortunate delay in diagnosis . . .
translated into a delay of timely treatment,” which “likely contributed to the persistence and
severity of symptoms.” Id.

         Dr. Vartanian described his concerns with the case reports relied upon by Dr. Höke in his
theory. Resp’t Ex. A at 2. Dr. Vartanian wrote that case reports are intended “to make the
community aware of potential risks.” Id. at 3 (bold in original). He noted that “case reports are
not proof of causality because they are not designed to be unbiased and they are certainly not
statistically powered.” Id. Dr. Vartanian wrote that the Agmon-Levin paper, Petitioner Exhibit
30, “does not achieve the minimal standards in epidemiology and bio-statistics to draw an
inference.” Id. He noted that the Agmon-Levin paper “is an aggregate of case studies and is [only]
as strong as its weakest link.” Id. Dr. Vartanian opined that the paper’s “weakest link” is
“essentially all of the case reports within it.” Id. He explained that the authors of the Agmon-
Levin paper drew conclusions from “a complex data set that involves[,] at a minimum[,] the
following variables: incidence of [TM;] the frequency of each of the relevant vaccines[;] time from
vaccination to symptoms[;] the presence or absence of infection clinically and documented by
acute and convalescent titers for IgM and IgG for relevant organisms[; and] seasonal variation.”
Id. at 2-3. Dr. Vartanian emphasized that the Agmon-Levin paper “does not even provide a
statistical framework to address such questions and thus is really more of a discussion of the
literature[; it is] a medical hypothesis rather than an analysis of risk.” Id. at 3. Dr. Vartanian also
described the Karaali-Savrun paper, Petitioner Exhibit 36, as “simply a report of cases and a
hypothesis.” Id.

       Additionally, Dr. Vartanian noted that the Agmon-Levin paper contains “no statistical
analysis discerning the probability of chance occurrence versus potentially causal occurrence.”
Resp’t Ex. A at 3. Dr. Vartanian explained that there are about 1,400 new cases of TM diagnosed
each year in the United States.29 Id. at 2. Therefore, he explained that, over a thirty-nine year span
such as the period covered by the Agmon-Levin paper,30 “the cumulative number of [TM] cases

28
  It is unclear whether Dr. Vartanian knew that Petitioner also received a Hep B vaccine in
November 2012 at the time he authored his expert report.
29
   Dr. Vartanian attributes this statistic to the National Institute of Neurological Disorders and
Stroke. Transverse Myelitis Fact Sheet, NAT’L INST. OF NEUROLOGICAL DISORDERS AND STROKE,
http://www.ninds.nih.gov/disorders/transversemyelitis/detail_transversemyelitis.htm.
30
  Pet’r Ex. 30 at 1 (noting that the authors of the study reviewed journals published between 1970
and 2009).
                                                  20
would be an estimated 54,600.” Id. at 2. He notes that the authors of the Agmon-Levin paper
found only thirteen cases of TM which they associated with Hep B over that period of time. Id.
Dr. Vartanian contrasted the Agmon-Levin paper with a paper authored by Shaw, et al., filed as
Respondent Exhibit C. Id. at 3. He described the Shaw paper as an “expertly conducted study
examining complications after the [H]ep[] B vaccine.” Id. He notes that the authors in that study
“ask[ed] the essential question: what is the expected rate of occurrence of transverse myelitis
following vaccination and what is the observed rate[?]” Id. Dr. Vartanian explained that “[i]f the
observed rate [of occurrence] is greater than the expected rate [of occurrence], then a signal exists
and warrants further investigation.” Id. However, he noted that the authors of the Shaw paper
found that “the observed rate of [TM] following vaccination was the same or lower than the
expected rate.” Id. Dr. Vartanian wrote that “[c]ausality is the job of epidemiologists and public
health scientists, and when they have investigated this question, the risk observed is not greater
than the risk expected.” Id.

        Dr. Vartanian wrote that TM “is a demyelinating disease of the Central Nervous System”
(“CNS”). Id. at 4. He explained that TM “often occurs as a presenting symptom of [MS] [or]
Neuromyelitis optica, [but that it] may remain as an isolated spinal cord disease.” Id. Dr.
Vartanian explained that because MS is a more common disease, “much of what we know about
environmental exposures comes from the MS literature and is extrapolated to TM.” Id. He noted
that “MS and TM share many pathophysiologic steps.” Id. He explained that “[p]art of th[e]
difficulty in ascribing pathophysiologic mechanisms to TM is that the number of cases with
comprehensive histopathologic assessments reported in the literature are few[,] and the clinical
presentation is quite variable.” Id. Dr. Vartanian wrote that “the data associating prior infection
as a risk factor for TM is reasonably strong[,] whereas the data associating prior vaccination with
TM remains extraordinarily weak and circumstantial.” Id. at 4.

        Dr. Vartanian wrote that the National Multiple Sclerosis Society (“NMSS”) has conducted
“extensive review” on “the relationship between vaccine[s] and CNS demyelinating disease.” Id.
at 4. He then provided five excerpted paragraphs from a document on the NMSS website,31
without commenting on any of the excerpts. Id. Each of the excerpts from the NMSS website
reflects that different organizations and studies have found no association between vaccines
(including the Hep B vaccine) and MS, optic neuritis, and/or “any other acquired central nervous
system demyelinating disease.” Id.

        Dr. Vartanian wrote that “[t]he cause of TM, like that of MS, is unknown, but
autoimmunity is thought to play a role.” Id. at 3. However, Dr. Vartanian wrote that “[w]e know
that peak antibody responses after hepatitis B immunization occur[s] around week 2.” Id. at 4. As
an example, he quoted the Sam paper, which states that “[t]he mean titer of anti-HBs antibody at
week 2 after booster vaccination was higher than at other time intervals.” Id. (quoting Resp’t Ex.
H at 4). Dr. Vartanian wrote that “[i]n cases where there has been a causal link between
immunization and human disease[,] the onset of symptoms is typically within 2-4 weeks [after]

31
  Living Well With MS: Diet, Exercise & Healthy Behaviors—Vaccinations, NAT’L MULTIPLE
SCLEROSIS SOC’Y, https://www.nationalmssociety.org/Living-Well-With-MS/Diet-Exercise-
Healthy-Behaviors/Vaccinations.

                                                 21
the immunization.” Id. at 5. Dr. Vartanian wrote that the onset of Petitioner’s symptoms, which
he states occurred on June 20, 2013, was 63 days after her last Hep B vaccination. Id. at 4. He
opined that “63 days is far too long for molecular mimicry to be implicated.” Id.

        In summary, Dr. Vartanian wrote that “Dr. Höke’s review of [TM] and the facts of this
case are accurate, but his connection between [H]ep[] B vaccination and the cause or risk of [TM]
in this case is not substantiated.” Resp’t Ex. A at 5. He opined that “[t]he medical literature and
evidence here does not support a causal relationship between [TM] and [H]ep[] B vaccination.”
Id.

                               ii.   Dr. Vartanian’s Testimony

        Dr. Vartanian testified that Dr. Höke’s testimonial description of TM was “perfectly
adequate.” Tr. 77. Dr. Vartanian testified that he “[a]bsolutely” agrees with Petitioner’s diagnosis
of TM. Id. at 105-06. Dr. Vartanian testified that, based on Petitioner’s medical records, her
symptoms of TM began on June 24, 2013. Id. at 77. He testified that he did not recall seeing
earlier symptoms, including fatigue and facial numbness, described in her medical record. Id.
Regardless, Dr. Vartanian testified that the location of the lesion in Petitioner’s thoracic spine
would not have caused facial numbness.32 Id. at 77-78. Dr. Vartanian testified that Petitioner
“ha[d] a fairly classic presentation” of TM, and noted that Petitioner “had a big lesion.” Id. at 102-
03. Dr. Vartanian opined that the onset of Petitioner’s symptoms was “a little atypical” because
“it was very rapid.” Id. at 92. He explained that TM typically presents, “from first symptoms to
maximum,” over “a day or a couple days.” Id. at 93. Dr. Vartanian testified that the severity of
Petitioner’s TM “was monumental.” Id. He also noted that there was a delay in arriving at her
diagnosis, “[s]o she never received proper treatment for her disease.” Id.

         Dr. Vartanian agreed with Dr. Höke that demyelinating disorders such as TM are most
common in people between the ages of 20 and 40. Tr. 108. Dr. Vartanian also agreed that the
current data shows that women are between 1.5 and 3 times more likely than men to be at risk for
MS. Id. at 107. Dr. Vartanian testified that “there [is] an increased risk of an exacerbation in MS”
during the postpartum period in women, which is “the only pregnancy-related data that [he]
know[s] of” relating to demyelinating disorders. Id. at 145. For TM specifically, Dr. Vartanian
testified that “the data [on male-versus-female risk] is actually variable.” Id. at 108. He explained
that in some reports, the risk is equal for men and women, while in other reports TM is more
common in women. Id. Dr. Vartanian emphasized that “[t]here aren’t that many cases” of TM;
“the incidence [of TM] is ten per million per year.” Id.

     Dr. Vartanian testified that “all inflammatory demyelinating diseases are thought to be
immune-mediated.” Tr. 106. Dr. Vartanian testified that a recent publication “points out that 30

32
  He explained that facial numbness may occur if a TM lesion is “in the very upper cervical spinal
cord,” but that was “not at all” what happened in Petitioner’s case. Tr. 101.

                                                 22
to 60 percent of [TM cases] seem[] to follow an antecedent infection.” 33 Id. at 93. He noted that
the percentages are analogous to GBS. Id. Additionally, Dr. Vartanian testified that a patient does
not “have to have a clinical infection to have a microorganism be responsible for the illness.” Id.
at 95. To illustrate his point, Dr. Vartanian stated that “it [has] been recently shown” that when
patients with GBS are tested “using a more sensitive assay for Campylobacter,34 then the number
of people who . . . are positive for Campylobacter approaches 70 or 80 percent,” even though “from
a gastrointestinal point of view, they are asymptomatic.” Id. at 94-95. In contrast, Dr. Vartanian
explained that, “in a healthy control population, th[at] number is 3 percent.” Id. at 95.

         Dr. Vartanian testified that he believes “that immunization with . . . an antigen can lead to
molecular mimicry,” which can cause an autoimmune reaction. Tr. 106. Thus, Dr. Vartanian
agreed with Petitioner’s counsel that “it’s possible that immunization could trigger a molecular
mimicry cross-reaction that would entail autoimmunity leading to transverse myelitis.” Id.
However, Dr. Vartanian also testified that “anything is possible under some really complex and
unusual circumstance.” Id. at 129. Dr. Vartanian testified that he does not believe “there is
remotely sufficient data for us to say [whether] molecular mimicry is a reasonable mechanism by
which [H]ep[] B can cause central nervous system demyelination.” Id. at 85. Dr. Vartanian
acknowledged “from the outset” that he is “not an epidemiologist,” but he testified that “the
epidemiological data is simply not there” to support the Petitioner’s theory. Id. Dr. Vartanian
testified that “epidemiology is an extraordinar[ily] difficult science because there are so many
variables.” Id. at 135. He explained that “data sets are cumbersome,” and there are “problems
with reliability on so many levels.” Id.

        Dr. Vartanian discussed several papers which looked at a possible association between
vaccines and TM. Dr. Vartanian acknowledged that, in a 2011 article, authors Awad and Stüve
wrote that thirty percent of pediatric TM cases are preceded by immunization within one month.
Tr. 109; Pet’r Ex. 33 at 3. However, he testified that he does not agree with that statement, and
that he has not “seen anything to support that” association, other than the statement in the Awad
and Stüve article, which references “one very, very old paper” and a case report with nine cases.
Tr. 110. Therefore, Dr. Vartanian testified that he does not “know of any association” between
vaccines and TM in the pediatric population.35 Id. at 111.

33
   The referenced publication was not specifically identified or filed. However, Dr. Vartanian
testified that it was authored by Doug Kerr, who he believes founded the Transverse Myelitis
Center at Johns Hopkins. Tr. 93.
34
   Dr. Vartanian explained that GBS is known to be caused by an immune response to “complex
carbohydrates on the surface of Campylobacter jejuni.” Tr. 94. He stated that Campylobacter “is
the most common organism” found where there is a known antecedent gastrointestinal infection
in a patient who has developed GBS. Id.
35
  Petitioner received all of her Hep B vaccines while she was in her early twenties, so she would
not be considered a pediatric patient. However, Dr. Vartanian acknowledged that there is
“something different about a 22 year old [and] a 40 year old in terms of their brain[s],” and agreed
with Petitioner’s counsel’s statement that “the sharp distinction between pediatric and adult
doesn’t exist in nature.” Tr. 112-13. Dr. Vartanian stated that he does not know of any data as to
                                                 23
        Discussing studies that looked at cases of TM following vaccination in the general
population, Dr. Vartanian testified that the 2016 Baxter paper “is a significantly better study” than
the 1988 Shaw paper. Tr. 98. In the Shaw paper, the authors found four cases of TM among
850,000 people who received the Hep B vaccine.36 Id.; Resp’t Ex. C. In contrast, in the Baxter
study, which involved “[o]ver nine million subjects in the cohort and over 64 million vaccines”
administered between 2007 and 2013, the authors found “only two patients [who] developed [TM]
as a first ever event” after receiving the Hep B vaccine.37 Tr. 95, 98-99; Resp’t Ex. L. Dr.
Vartanian agreed with Dr. Höke’s assessment that reporting of adverse events is “not as good as
we want it to be.” Tr. 98. However, Dr. Vartanian testified that the Baxter paper “is, by far, the
best” of the papers that he looked at because “the [sample size] is the largest and the analysis is
really well done.” Id. at 138. He explained that, because the authors of that paper collected data
by reviewing medical records and identifying the diagnostic codes used by the treating physicians
themselves, that study was “less subject to underreporting than a typical study.” Id. at 99, 138.

        Dr. Vartanian acknowledged that TM in general, and vaccine reactions in general, are rare.
Tr. 150. With the disclaimer that he is not an epidemiologist, Dr. Vartanian testified that such rare
events can be properly accounted for with epidemiological studies “if the studies are large
enough.” Id. at 150-51. Dr. Vartanian testified that the relative rarity of TM generally does not
affect his view of the accuracy of the results in the Baxter study, as he believes the Baxter study
was sufficiently large to account for the rarity of both TM and vaccine reactions. Id. at 140, 150-
51. In fact, he testified that, “by virtue of the fact that they had so few cases [of TM] and so many
vaccines, it really hammers home the point that the vaccine is probably not related” to TM. Id. at
141.

        Dr. Vartanian noted that the 2004 Hernán paper is the only study he has seen where there
was an association found between the Hep B vaccine and TM. Tr. 99. Discussing that paper, Dr.
Vartanian explained that the methodology used represents “a very legitimate way of doing a
study.” Id. at 85-86; Pet’r Ex. 58. Dr. Vartanian testified that the paper is “[a]bsolutely not”
perfect, but that it is “better than the case reports.”38 Tr. 135. However, Dr. Vartanian explained

whether the difference in a 22-year-old’s brain and a 40-year-old’s brain potentially makes one
more susceptible to autoimmunity following a vaccination. Id. at 112.
36
   Dr. Vartanian acknowledged that the Shaw paper analyzed reports of neurological illness
following administration of a plasma-derived Hep B vaccine, whereas the Hep B vaccine currently
in use is the recombinant Hep B vaccine. Tr. 136; Resp’t Ex. C. Dr. Vartanian testified that the
two vaccines do not create an “optimal comparison,” but that he “would imagine the risk would
have been worse” with the plasma-derived vaccine, because “it’s probably not as good of a vaccine
in terms of its cleanliness.” Tr. 137.
37
     Among all of the recipients of any vaccine, the authors found seven cases of TM. Tr. 99.
38
  Dr. Vartanian described the Agmon-Levin paper, Petitioner Exhibit 30, as a series of case reports
and a review of the literature. Tr. 89. Dr. Vartanian testified that the Karaali-Savrun paper,
Petitioner Exhibit 36, is likewise “just case reports.” Id.
                                                 24
that the 2004 Hernán paper “disagrees with the prior studies,” and was “a direct contradiction to
another major study” done previously by DeStefano. Id. at 86, 88; Resp’t Ex. M.39 Dr. Vartanian
testified that the authors of the 2004 Hernán paper acknowledged some of its shortcomings, and
he noted that the medical community did not know about “other risk factors for MS that could
. . . be confounders” for the disease, such as occupation, vitamin D, and smoking. Tr. 87. Dr.
Vartanian testified that the 2004 Hernán paper prompted DeStefano to review the methodology
and reanalyze the data set. Id. at 88. He testified that, after reanalysis, DeStefano and his coauthors
“didn’t come up with an association between MS and the hepatitis B vaccine.” Id.; Resp’t Ex. N.40
Thus, while the 2004 Hernán paper found an increased risk of MS after Hep B vaccination, Dr.
Vartanian testified that the balance of the medical literature, including the 2006 Hernán paper,
supports no such risk. Tr. 88; Resp’t Ex. J.

           Dr. Vartanian testified that the 2006 Hernán paper “reminded [him] of academic arguing,
like intellectual banter.” Tr. 151. He explained that “DeStefano had done very important work in
2002. Hernán refuted that in 2004. DeStefano reanalyzed the data sets based on Hernán 2004 and
still . . . didn’t come up with an association.” Id. Therefore, Dr. Vartanian testified that he “felt
like Hernán was trying to justify their original study in some way and explain the differences,” and
Dr. Vartanian thought “[t]hey did the best that they could at that.” Id. at 151-52. He testified that
“[t]he problem in all cases is that” the authors were not working with the same data set for all three
studies, and the epidemiology itself is complicated. Id. at 152.

        Based on his analysis of the literature, Dr. Vartanian testified that “there is no statistical
association” between the Hep B vaccine and TM. Tr. 99. He also noted that he did not see an
indication in the medical records that any of Petitioner’s treating physicians believed that her third
Hep B vaccine played a role in the development of TM. Id. at 100.

        Dr. Vartanian also testified regarding Petitioner’s molecular mimicry theory of causation.
Preliminarily, Dr. Vartanian testified that there is “no data that you need an injury . . . to the blood-
brain barrier outside of the immune response to get . . . focal or multifocal inflammatory [central
nervous system] demyelination.” Tr. 100. Dr. Vartanian testified that he does not know of “any
data from what we know about autoimmunity [or] molecular mimicry that requires a secondary
event for central nervous system demyelination.” Id. at 149. As an example, he testified that the
original rabies vaccines “had a very high incidence of inducing acute disseminated
encephalomyelitis.” Id. He explained that the rabies vaccine is “a human example . . . in which

39
   Frank DeStefano, Thomas Verstraeten, Lisa A. Jackson, Catherine A. Okoro, Patti Benson,
Steven B. Black, Henry R. Shinefield, John P. Mullooly, William Likosky & Robert T. Chen,
Vaccines and Risk of Central Nervous System Demyelinating Diseases in Adults, 60 ARCHIVES
NEUROLOGY 504 (2003).
40
   Frank DeStefano, Eric S. Weintraub & Robert T. Chen, Correspondence to the Editor, 64
NEUROLOGY 1317 (2005) (letter to the editor regarding Miguel A. Hernán, Susan S. Jick, Michael
J. Olek & Hershel Jick, Recombinant Hepatitis B Vaccine and the Risk of Multiple Sclerosis: A
Prospective Study, 63 NEUROLOGY 838 (2004)).

                                                   25
peripheral immunization, without anything else going on, cause[d] a central nervous system
disease without a second hit or second event.” Id. at 149-50.

         Dr. Vartanian explained that, related to “molecular mimicry, the [amount of] basic
scientific literature is enormous for central nervous system demyelination.” Tr. 82. He testified
that there are “over 12,000 articles published” for just one animal model, experimental allergic
encephalomyelitis (“EAE”).41 Id. at 82-83. In contrast, there are “relatively few[,] . . . maybe less
than 1,000[,] articles on the peripheral nervous system equivalent to that model.” Id. at 82. During
his testimony, Dr. Vartanian drew a graph of disease progression in the EAE model. Resp’t Ex.
K (bottom graph). He explained that after a healthy animal is immunized with any myelin antigen,
they progressively start to get sick, “they have peak disease” by two to three weeks, and then the
severity of the disease progressively lessens. Tr. 83. Thus, the EAE model shows a bell-shaped
curve, with the top of the curve occurring around two or three weeks post-immunization. Resp’t
Ex. K (bottom graph). Dr. Vartanian emphasized that the chart’s bell-shaped curve is “not an
incidence curve” representing the “frequency of disease onset.” Tr. 124. Instead, it is a “disease
severity curve.” Id. Therefore, he explained, it is “very reliable” that the onset of disease will
cluster at or near the peak of the bell-curve.42 Id.

        Dr. Vartanian testified that “molecular mimicry, as we understand it scientifically, [ ]
typically follows the peak immune response . . . fairly closely.” Tr. 118. He explained that, based
on “the data for the immune response, as we understand molecular mimicry from a humoral
standpoint, [ ] that peak happens [at] two to three weeks.” Id. at 129. Dr. Vartanian, referencing
Respondent Exhibit H, testified that peak immune response to the Hep B vaccine, and vaccines
generally, is “around two weeks.”43 Id. at 91. He noted that immune response can be represented

41
  EAE is “an animal model for acute disseminating encephalomyelitis in which the characteristic
pathophysiology and clinical signs of this disease are produced by immunization of an animal with
extracts of brain tissue or with myelin basic protein together with Freund adjuvant; it is transferable
by adoptive transfer of lymphocytes but not by serum.” Dorland’s Illustrated Medical Dictionary
614 (32nd ed. 2012) [hereinafter “Dorland’s”].
42
  Dr. Vartanian acknowledged that “[t]he human nervous system is more complex than a monkey
or a mouse.” Tr. 125. Dr. Vartanian thus agreed with Petitioner’s counsel that “there are reasons
to be cautious about extrapolation from animal models to conclusions about . . . medical theories
in general in humans.” Id. at 126. However, he testified that approximately “90 percent of the
autoimmunity animal modeling for MS or allied diseases is done in rodents.” Id. at 125. He noted
that the original studies were conducted with monkeys, and that there are still some studies with
primates, but “the data for that is . . . very much similar to the rodent work.” Id. at 125.
43
   Dr. Vartanian acknowledged that the literature provides varying timelines for peak response to
vaccines. Tr. 113-15. However, he testified that there is a lot of variation in the response to
different vaccines, and he opined that “if [he] were going to make a comment on when [ ] the
humoral response peak[s] following a [H]ep[] B vaccine, [he] would go to hepatitis B literature.”
Id. at 115. Dr. Vartanian testified that the Hep B literature that he is familiar with places peak
response at “mostly around two weeks.” Id.

                                                  26
by “a bell-shaped curve, but it really peaks around two weeks.” Id. He also testified that “there
[is] a lot of other data out there that supports this timing of peak immune response.” Id. He
testified that he could “come up with a list of . . . probably 15 or 20 papers that all show this timing
for the peak immune response being two to three weeks after immunization.” Id. After peak
immune response, he explained, the process of molecular mimicry “follows relatively quickly,”
based on “what we know about immunity and secondary injury to the nervous system.” Id. at 129.

        Dr. Vartanian explained that the reason three Hep B vaccinations are given is so that the
recipient gets a “big boost in antibody titers.” Tr. 79. Dr. Vartanian testified that with the first
and second vaccinations, “there is a big increase in the number of B cells that are specific to the
surface antigen for hepatitis B in the vaccine[, b]ut the immune response is not that big.” Id. He
explained that, in contrast, “the immune response with a booster is really robust.” Id. Dr.
Vartanian testified that one should not “us[e] the B cells as a measure of what [ ] the pathogenic
response is.” Id. at 131-32. Instead, one should look at “the humoral response, which is the serum
antibody levels.” Id. at 132.

        Dr. Vartanian drew a graph to illustrate the immune system’s B-cell response after the first,
second, and third Hep B vaccinations. Resp’t Ex. K. He illustrated that “the percentage of
circulating B cells, which are the antibody-producing cells that are the memory cells,” rises quickly
after the first vaccination. Tr. 81; Resp’t Ex. K (dotted line in top chart). The number of B-cells
then drops, but the cells are still above baseline by the second vaccination. Id. After the second
vaccination, the number of B-cells “go[es] up a little” again, but does not reach the same peak as
after the first vaccination. Id. After the third vaccination, the number of B-cells “go[es] up even
less.” Id. Thus, Dr. Vartanian explained that “the cells that are making the antibod[ies] are really
induced early on,” which creates “immunologic memory or central memory.” Tr. 81.

         Dr. Vartanian also explained and graphed typical antibody response, specifically the
Immunoglobulin-G (“IgG”)44 response.45 Tr. 81-82; Resp’t Ex. K (solid line in top chart). He
illustrated that IgG levels rise slightly in response to the first and second vaccinations, lowering
again between vaccinations but remaining above baseline. Id. In contrast, after the third
vaccination, the response “just goes way up.” Id. He explained that “there [is a] massive increase
in the number of circulating antibodies” after the third vaccination. Tr. 82. Dr. Vartanian
explained that the peak IgG response illustrated in his graph occurs two or three weeks after the
third vaccination. Tr. 82; Resp’t Ex. K (solid line in top chart). Based on that understanding, Dr.
Vartanian testified that the fact that Petitioner had no apparent adverse response after the first two
Hep V vaccinations is of no consequence, while he testified that it is significant that Petitioner’s
symptoms began after her third Hep B vaccination. Tr. 78-79, 147.

       To further illustrate his explanation of the antibody response after vaccination, Dr.
Vartanian referenced Table 1 of the Sam paper, Respondent Exhibit H. Tr. 133; Resp’t Ex. H at

44
   “Immunoglobulin” refers to “any of the structurally related glycoproteins that function as
antibodies, divided into five classes (IgM, IgG, IgA, IgD, and IgE) on the basis of structure and
biologic activity.” Dorland’s at 919.
45
     He testified that there is “a similar but lesser pattern” for Immunoglobulin-M response. Tr. 82.
                                                  27
4. Dr. Vartanian noted that the table shows the anti-Hep B surface antigen antibodies in seven
patients before and after booster vaccination. Tr. 133. Dr. Vartanian explained that the subjects’
individual antibody levels varied widely when compared to each other both before vaccination
(where known) and after vaccination. Id. However, Dr. Vartanian emphasized that, for each of
the seven subjects, individual peak response came at week two. Id. Dr. Vartanian acknowledged
that each of the individuals’ antibody levels remained “much higher” than pre-vaccination levels
at weeks 4, 8, and 16 post-vaccination. Id. at 134.

       Dr. Vartanian testified that “for molecular mimicry in general, you have to have some
minimum quantity [of] T cell or humoral immunity.” Tr. 121. He explained that if a person is
“susceptible to autoimmunity following an immunization,” the question is “not what [that
person’s] minimal titer requirement is at some distant time point.” Id. Instead, Dr. Vartanian
explained that the question is when the person first achieves that minimal titer requirement for
autoimmunity after immunization, “because at that point is when symptoms occur.” Id. In other
words, although a person’s immune response may elevate, peak, and then lower but remain
elevated above baseline for an extended period of time, an autoimmune response, if it is going to
occur, would be expected to occur the first time autoimmune response reaches a particular level.
Therefore, he testified that, despite a patient’s antibody levels remaining higher than baseline for
an extended period, “it’s unlikely” that TM appearing at week eight after vaccination would be
vaccine-related. Id. at 134-35.

        Dr. Vartanian acknowledged that medicine is complex, and that “things don’t present
exactly the same in any two patients ever.” Tr. 90. Dr. Vartanian explained that “the human body
is complex, the immune system is complex, [and] the nervous system is complex.” Id. at 115.
Therefore, he admitted that when “the two most complex systems . . . interact to cause a disease,
there [is] a lot of variation.” Id. However, he testified that “when we come up with [ ] cutoffs for
timing, the cutoff happens because we’re trying to think, okay, what is our limit, what is the limit
we would accept as rational for timing.” Id. at 90. He explained that, “if we go beyond that
rational limit, then 100 percent of anything that happens to anyone who gets vaccinated will always
be legitimate.” Id.

        In Dr. Vartanian’s opinion, any incident of autoimmunity at sixty days post-vaccination “is
an outlier.” Tr. 130. He testified that he does not “know who came up with that 60 days,” but he
“imagine[s] that [the 60-day time frame] came to be to make sure that we were capturing beyond
-- beyond question most -- the majority of cases.” Id. Therefore, Dr. Vartanian testified that
Petitioner’s onset of symptoms, even if it was 62 days after the vaccination, “medically does not
fit and scientifically does not fit.” Id. at 91-92. He testified that Petitioner’s TM was idiopathic.
Id. at 92.

        IV.    The Applicable Legal Standard

        To receive compensation under the Vaccine Act, Petitioner must demonstrate either that:
(1) Petitioner suffered a “Table injury” by receiving a covered vaccine and subsequently
developing a listed injury within the time frame prescribed by the Vaccine Injury Table set forth
at 42 U.S.C. § 300aa-14, as amended by 42 C.F.R. § 100.3; or (2) that she suffered an “off-Table
injury,” one not listed on the Table as a result of her receipt of a covered vaccine. See 42 U.S.C.

                                                 28
§§ 300aa-11(c)(1)(C); Moberly v. Sec’y of Health & Human Servs., 592 F.3d 1315, 1321 (Fed.
Cir. 2010); Capizzano v. Sec’y of Health & Human Servs., 440 F.3d 1317, 1319-20 (Fed. Cir.
2006). Petitioner does not allege a Table injury in this case; thus she must prove that her injury
was caused-in-fact by a Table vaccine.

        To establish causation-in-fact, Petitioner must demonstrate by a preponderance of the
evidence that the vaccine was the cause of the injury. 42 U.S.C. § 300aa-13(a)(1)(A). Petitioner
is required to prove that the vaccine was “not only a but-for cause of the injury but also a substantial
factor in bringing about the injury.” Moberly, 592 F.3d at 1321-22 (quoting Shyface v. Sec’y of
Health & Human Servs., 165 F.3d 1344, 1352-53 (Fed. Cir. 1999)).

        In the seminal case of Althen v. Secretary of the Department of Health and Human Services,
the Federal Circuit set forth a three-pronged test used to determine whether a petitioner has
established a causal link between a vaccine and the claimed injury. See 418 F.3d 1274, 1278-79
(Fed. Cir. 2005). The Althen test requires the petitioner to set forth: “(1) a medical theory causally
connecting the vaccination and the injury; (2) a logical sequence of cause and effect showing that
the vaccination was the reason for the injury; and (3) a showing of a proximate temporal
relationship between vaccination and injury.” Id. at 1278. To establish entitlement to
compensation under the Program, Petitioner is required to establish each of the three prongs of
Althen by a preponderance of the evidence. See id.

        Specifically, under the first prong of Althen, Petitioner must offer a scientific or medical
theory that answers in the affirmative the question “can the vaccine(s) at issue cause the type of
injury alleged?” See Pafford v. Sec’y of Health & Human Servs., No. 01-0165V, 2004 WL
1717359, at *4 (Fed. Cl. Spec. Mstr. July 16, 2004), aff’d, 64 Fed. Cl. 19 (2005), aff’d, 451 F.3d
1352 (Fed. Cir. 2006). To satisfy this prong, a petitioner’s theory must be based on a “sound and
reliable medical or scientific explanation.” Knudsen v. Sec’y of Health & Human Servs., 35 F.3d
543, 548 (Fed. Cir. 1994). Such a theory must only be “legally probable, not medically or
scientifically certain.” Id. at 548-49. This may be accomplished in a number of ways.

        “Reliability and plausibility of [ ] pathogenesis can be bolstered by providing evidence that
at least a sufficient minority in the medical community has accepted the theory as to render it
credible.” Pafford, 2004 WL 1717359, at *4. Additionally, “epidemiological studies and an
expert’s experience, while not dispositive, lend significant credence to the claim of plausibility.”
Id. “Articles published in respected medical journals, which have been subjected to peer review,
are also persuasive.”46 Id.

46
   Both parties filed medical and scientific literature in this case, but not every filed item factors
into the outcome of this decision. While the undersigned has reviewed all of the information filed
in this case, only those articles and records that are most relevant to the decision will be discussed.
Moriarty v. Sec’y of Health & Human Servs., 844 F.3d 1322, 1328 (Fed. Cir. 2016) (“We generally
presume that a special master considered the relevant record evidence even though he does not
explicitly reference such evidence in his decision.”) (citation omitted); see also Paterek v. Sec’y
of Health & Human Servs., 527 F. App’x 875, 884 (Fed. Cir. 2013) (“Finding certain information
not relevant does not lead to–and likely undermines–the conclusion that it was not considered.”).
                                                  29
         However, publication of an article “‘does not necessarily correlate with reliability,’ because
‘in some instances well-grounded but innovative theories will not have been published.’” Id.
(quoting Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579, 593–94 (1993)) (emphasis
in original). Therefore, petitioners may satisfy the first Althen prong without relying on medical
literature, epidemiological studies, demonstration of a specific mechanism, or a generally accepted
medical theory. Andreu v. Sec’y of Health & Human Servs., 569 F.3d 1367, 1378-79 (Fed. Cir.
2009) (citing Capizzano v. Sec’y of Health & Human Servs., 440 F.3d 1317, 1325-26 (Fed. Cir.
2006)). Special masters, despite their expertise, are not empowered by statute to conclusively
resolve what are essentially thorny scientific and medical questions, and thus scientific evidence
offered to establish Althen prong one is viewed “not through the lens of the laboratorian, but
instead from the vantage point of the Vaccine Act’s preponderant evidence standard.” Id. at 1380.
Accordingly, special masters must take care not to increase the burden placed on petitioners in
offering a scientific theory linking vaccine to injury. Contreras v. Sec’y of Health & Human Servs.,
121 Fed. Cl. 230, 245 (2015) (“[p]lausibility . . . in many cases may be enough to satisfy Althen
prong one” (emphasis in original)), vacated on other grounds, 844 F.3d 1363 (Fed. Cir. 2017).
But this does not negate or reduce a petitioner’s ultimate burden to establish his overall entitlement
to damages by preponderant evidence. W.C. v. Sec’y of Health & Human Servs., 704 F.3d 1352,
1356 (Fed. Cir. 2013) (citations omitted).

        In addition to showing that the vaccine at issue can cause a particular injury, a petitioner
must also, under Althen’s second prong, prove that the vaccine actually did cause the alleged injury
in a particular case. See Pafford, 2004 WL 1717359, at *4; Althen, 418 F.3d at 1279. The second
Althen prong requires proof of a logical sequence of cause and effect, usually supported by facts
derived from a petitioner’s medical records. Althen, 418 F.3d at 1278; Andreu, 569 F.3d at 1380;
Capizzano, 440 F.3d at 1326; Grant v. Sec’y of Health & Health Servs., 956 F.2d 1144, 1148 (Fed.
Cir. 1992). Medical records are generally viewed as particularly trustworthy evidence, since they
are created contemporaneously with the treatment of the patient. Cucuras v. Sec’y of Health &
Human Servs., 993 F.2d 1525, 1528 (Fed. Cir. 1993). A petitioner does not meet this obligation
by showing only a temporal association between the vaccination and the injury; instead, the
petitioner “must explain how and why the injury occurred.” Pafford, 2004 WL 1717359, at *4
(emphasis in original).

        While a temporal association alone is insufficient to establish causation, under the third
prong of Althen, a petitioner must show that the timing of the injury fits with the causal theory.
See Althen, 418 F.3d at 1278. For example, if the petitioner’s theory involves a process that takes
several days to develop after vaccination, an injury that occurred within a day of vaccination would
not be temporally consistent with that theory. Conversely, if the theory is one that anticipates a
rapid development of a reaction post-vaccination, the development of the alleged injury weeks or
months post-vaccination would not be consistent with that theory. Causation-in-fact cannot be
inferred from temporal proximity alone. See Grant v. Sec’y of Health & Human Servs., 956 F.2d
at 1148; Thibaudeau v. Sec’y of Health & Human Servs., 24 Cl. Ct. 400, 403-04 (1991); see also
Hasler v. United States, 718 F.2d 202, 205 (6th Cir. 1983) (“Without more, [a] proximate temporal
relationship will not support a finding of causation.”).

        A petitioner who demonstrates by a preponderance of the evidence that she suffered an
injury caused by vaccination is entitled to compensation, unless Respondent can demonstrate by a

                                                  30
preponderance of the evidence that the injury was caused by factors unrelated to the vaccination.
See Althen, 418 F.3d at 1278; Knudsen, 35 F.3d at 547.

        V.     Discussion

                      A. Experts

        In this case, the experts presented by Petitioner and Respondent agree on Petitioner’s
diagnosis of acute TM. Dr. Höke and Dr. Vartanian are both neurologists who focus on research
and academia, but also maintain a small practice area that includes patients with TM. Dr. Höke’s
expertise is rooted in research specific to peripheral neuropathy, while Dr. Vartanian focuses on
the central nervous system and incorporates an immunology component into his research. As a
result, Dr. Höke is less conversant on the timing and nature of the immunological pathogenesis of
TM, and his theory is vague in that area. Dr. Vartanian’s experience in immunology research
allows him to effectively distinguish between diseases that attack the central and peripheral
nervous systems, and to further explain how although molecular mimicry may be a plausible
mechanism for vaccine injury in other circumstances, it is not applicable in this case.

                      B. Althen Prong One

       Petitioner’s theory is based on the concept of molecular mimicry, which has been proffered
successfully in several cases involving demyelinating conditions, including TM. Schmidt v. Sec’y
of Health & Human Servs., No. 07-20V, 2009 WL 5196169 (Fed. Cl. Spec. Mstr. Dec. 17, 2009);
Hargrove v. Sec’y of Health & Human Servs., No. 05-0694V, 2009 WL 1220986 (Fed. Cl. Spec.
Mstr. Apr. 14, 2009). Furthermore, the recent addition of GBS to the list of vaccine table injuries
provides evidence that Respondent does not deny outright that at least one demyelinating
condition, albeit one that affects the peripheral nervous system, can be caused by vaccination.47

        In his reports and during his testimony, Dr. Höke relied heavily on papers that discuss
vaccine-related GBS. Dr. Höke described GBS as “the most well-studied experimentally of all
autoimmune diseases of the nervous system,” and stated that “the molecular mimicry process was
really well proven” because the medical community has identified how a particular antibody
“makes a mistake and goes and attacks a corresponding molecule on the nervous tissue.” Tr. 63.
Dr. Höke analogizes this reaction to TM, stating that although the conditions affect different
branches of the nervous system, “there is a similar process” but we “just don’t know what the
protein is or lipid is or sugar moiety is.” Id. Despite Dr. Höke’s inability to provide any support
for his contention that the causation theory that has been used to explain the development of GBS
following the administration of some vaccines should be applied to TM following the Hep B
vaccine, it certainly seems plausible that there may be an avenue by which molecular mimicry
serves as the catalyst for inflammation and neurological injury. Indeed, Dr. Vartanian admitted
that he believes that “immunization with . . . an antigen can lead to molecular mimicry.” Id. at
106.

47
  GBS occurring after receipt of a seasonal flu vaccine, with the first symptom occurring not less
than 3 days and not more than 42 days post-vaccination, is a Table injury. 42 C.F.R.
§ 100.3(a)(XIV)(D).
                                                31
        The strength of the theory used to explain how GBS occurs as the result of vaccination lies
in the fact that it is so widely studied and understood. Without a similar understanding of TM, or
an explanation of why the two conditions would be synonymous in pathogenesis, the diseases are
not simply interchangeable within a causation theory. The Vaccine Act, pursuant to the
preponderance standard, does not require identification and proof of specific biological
mechanisms. Althen, 418 F.3d at 1280 (quoting Knudsen, 35 F.3d at 549). In fact, the very nature
of a program anticipates that vaccine injury is a “field bereft of complete and direct proof of how
vaccines affect the human body.” Id. It is not enough, however, to find a theory that has been
successful in the past and insert it into a case involving a similar condition without a plausible
explanation of why the theory continues to work.

         Dr. Höke provided a brief overview of two papers that included case reports of patients
presenting with TM following a Hep B vaccination. Pet’r Exs. 30, 36. He then discussed the
Hernán paper, which had a larger patient pool but focused on MS following a Hep B vaccination.
Pet’r Ex. 58. Dr. Höke used the Hernán paper to point out that there was an increase in the number
of MS patients that were vaccinated against Hep B for 3 years following vaccination. Tr. 35. Dr.
Höke continued that for these patients, the antibodies that developed in their systems following
vaccination remained high. Id. at 36. He also noted that in another study, “the levels of the
antibody response among patients who received Hep B vaccine” showed “no statistically
significant differences between week 8 and 16.” Id.; Resp’t Ex. H. At that point in his testimony,
Dr. Höke did not immediately explain why these sustained elevated antibody titers were important
to his theory. Instead, he made a general assertion that the Hernán paper “clearly shows that there
was a threefold higher incidence of MS in patients who received [a] [H]ep B vaccine,” which
“shows a possible link between an event and a certain disease.” Tr. 40. He continued that, despite
his discussion of scientific literature, the research “may not be that easy to use . . . because there
are so many other variables that may not be obvious in an epidemiological study.” Id. Dr. Höke
mentioned a pre-existing susceptibility or “inflammatory response or reaction” as possible
“variables” which could lead to the development of TM. Id. at 43. However, these “variables”
described by Dr. Höke are also well-established, independent causes for the development of TM
without vaccination. His opinion that one of these events need be present for his theory to work
calls into question the role the vaccine would actually play in the development of TM in a patient.

         Dr. Höke conceded that the “pathogenic mechanism” in his theory is “unknown.” Pet’r
Ex. 28 at 5. In his report, he equivocated by stating that he believed the process to be “an
autoimmune phenomenon related to [a] molecular mimicry hypothesis.” Id. (citing Pet’r Ex. 33).
It is unclear what Dr. Höke means by “related to,” but the study that he cites makes clear that there
is a “more established link between molecular mimicry and … [GBS].” Pet’r Ex. 37 at 10. The
authors of the study are careful to note that “very little is known definitively about the inciting
cause of inflammation in the CNS of patients with TM, [and] nothing is currently understood about
the mechanisms of tissue injury in this inflammatory disease.” Id.

       Had Petitioner’s theory ended there, despite a lack of specificity with respect to the
development of TM in vaccinated patients, Petitioner’s theory may have been sufficiently plausible
under Althen prong one. However, Petitioner’s expert presented additional evidence to support his

                                                 32
theory which must also be considered to determine its plausibility.48 This additional information
undermined the theory and convoluted Petitioner’s position so that it is not, by the preponderance
of the evidence, based on a “sound and reliable medical or scientific explanation.” Knudsen, 35
F.3d at 548.

        Dr. Höke testified that his theory is only applicable “in the appropriate environment”
wherein some patients develop an antibody response to the vaccine and “those antibodies can get
access to the spinal cord and cause [TM].” Tr. 32. Dr. Höke conceded that his theory does not
provide an explanation for why all vaccinated persons do not develop TM. He noted only that
“there is probably a secondary event that triggers the access of the antibodies to the central nervous
system.” Id. at 36. It is unclear if this secondary event could also be one of the “variables” that
affects the significance of the epidemiological studies he discussed. Dr. Höke’s examples of a
secondary event include “a trauma” or a “genetic makeup” that results in a blood-brain barrier that
is “more leaky.” Id. at 46-47. Dr. Höke did not explain how either of the aforementioned
secondary events combine with a vaccination to cause demyelinating disease. This secondary
event is not supported by any literature presented by Dr. Höke, and seems to be a catch-all that
cannot be disputed or reasoned. In essence, Dr. Höke touts an unspecified, possibly inapplicable
mechanism, coupled with an unknown, widely variable and potentially unrelated secondary event.
That theory connects Petitioner’s case with the existing literature only by the ipse dixit of the
expert, and it therefore does not meet the preponderant standard. See Cedillo v. Sec’y of Health &
Human Servs., 617 F.3d 1328, 1339 (Fed. Cir. 2010) (“A court may conclude that there is simply
too great an analytical gap between the data and the opinion proffered.”) (quoting Gen. Elec. Co.
v. Joiner, 522 U.S. 136, 146 (1997)).

                       C. Althen Prong Two

        In successful claims, a Petitioner’s symptoms can serve to specifically illustrate and
reinforce the mechanism that is asserted pursuant to prong one. In Petitioner’s case, Dr. Höke
applied his causation theory to Petitioner by noting her prior healthy history, confirmed diagnosis
of TM, age, and gender. There was no testimony that relied on Petitioner’s medical history to
explain how or why she, in particular, developed TM following vaccination. Dr. Höke did not
point to anything in the record that suggested that Petitioner suffered from an autoimmune and/or
inflammatory process. He did not identify Petitioner’s necessary “secondary insult” that “makes
[her] blood-brain barrier more leaky.” Id. at 46-47. Petitioner provided no medical tests of
testimony to explain why or how the alleged process occurred following Petitioner’s third
vaccination. Furthermore, Dr. Höke’s assertion that the risk for cross-reactivity remains “as long
as there’s elevated antibody levels in the blood” was weakened under cross-examination. When
questioned about a recommendation for “what the peak [time frame] would look like,” Dr. Höke

48
    Even though it is well understood that a claimant need not establish a specific biological
mechanism in order to meet his burden of proof with respect to the first Althen prong, Althen, 418
F.3d at 1280, where a claimant offers such evidence and makes it a centerpiece of her causation
theory (especially in the absence of other kinds of evidence linking the relevant vaccine to the
claimed injury), it is appropriate for the special master to weigh the evidence offered and determine
if the claimant has successfully met her self-determined evidentiary goal. See W.C., 704 F.3d at
1360-61.
                                                 33
took his point to an illogical conclusion and noted that “up to three years you have increased risk.”
Id. at 64-65. Dr. Höke’s opinion that molecular mimicry is plausible three years following
vaccination is not persuasive absent some sort of immunodeficiency or suppressed immune
system.

        Often, an expert will use the temporal relationship between the vaccination and the onset
of injuries to explain how an autoimmune response developed into molecular mimicry in a
particular case. Petitioners usually rely on the timeline used for GBS table cases as a baseline.
Here, Dr. Höke spent a good deal of time explaining why literature that discussed plausible
timelines for an autoimmune injury post-vaccination included “artificial cutoff[s].” Tr. 61-62. Dr.
Höke also made it clear that epidemiological studies focus on a “standard period” of time between
vaccination and onset with little regard to outliers. Id. at 37. He then discussed the temporal
relationship in Petitioner’s case and noted that it is “luck” that determines onset. Id. at 65-66.
Because there can be “very similar levels of antibodies in [a petitioner’s] blood at six weeks, eight
weeks or ten weeks,” he explained, the increase of antibodies in the blood is the determining factor
and it “take[s] some time” for “significant demyelination to result.” Id. at 42. Attributing the
onset of her symptoms to “luck” does not persuasively explain how or why TM occurred in
Petitioner’s case.

        It is not in dispute that Petitioner suffered from TM after she received a series of Hep B
vaccinations. However, that chronology of events alone does not provide persuasive evidence
under the preponderant standard of causation. Furthermore, Petitioner’s own expert admitted that
Petitioner is “the appropriate gender and age group,” and that Petitioner’s age group and gender
“put[] her at high risk” for TM. Tr. 38, 44-45. Dr. Höke opined that Petitioner had an “aberrant
response” to the Hep B vaccine, which he “suspect[s] [was due to] a combination of [Petitioner’s]
genetic makeup or other risk factors.” Id. at 32. However, Dr. Höke did not identify anything
about Petitioner’s genetic makeup which would make her more susceptible to an “aberrant
response” following the vaccine. He likewise did not identify a secondary insult or injury, if any,
that Petitioner may have sustained which would support the application of his theory to her case.
In fact, Dr. Höke conceded that, if Petitioner had not received the Hep B vaccine, he would
characterize her TM as idiopathic. Id. at 61. Similarly, Dr. Vartanian testified that Petitioner’s
TM was idiopathic. Id. at 92. Without additional support explaining how or why TM occurred in
Petitioner’s case, Dr. Höke’s opinion appears to be based largely on assumption. Therefore,
Petitioner has not established by a preponderance of the evidence that the development of her TM
was caused by vaccination as opposed to an idiopathic etiology.

                       D. Althen Prong Three

         It is difficult to ascertain whether there was an appropriate temporal relationship between
Petitioner’s vaccine and the development of her TM based on Dr. Höke’s opinion, because he did
not clearly define the applicable onset window. Dr. Höke made a distinction between the use of a
“cutoff” for “policy purposes” and the application of an “artificial cutoff” to an individual patient.
Id. at 62, 65. He stated that there are always people that will fall outside of one standard deviation
of a cutoff, especially in the context of rare conditions such as TM. Dr. Höke cited the Siegrist
article to point out that the immune response to an antigen exposure can result in elevated antibody
titers for over six months. Resp’t Ex. I at 9. Dr. Höke went on to explain that elevated antibody

                                                 34
levels could result in the development of an autoimmune injury at any time following antigen
exposure, and consequently, his theory is not based on a specific timeframe. Dr. Höke’s
conclusion that the temporal relationship between vaccination and the onset of symptoms is not
probative of whether a vaccine-induced injury has occurred appears to be an attempt to explain the
60+ days that lapsed between Petitioner’s vaccination and symptoms onset. Instead, it undercuts
the persuasiveness of his entire theory. Dr. Höke’s suggestion that there may be no time frame at
all, when taken to its logical conclusion, presents the possibility raised by Dr. Vartanian that “if
we go beyond that rational limit [for timing], then 100 percent of anything that happens to anyone
who gets vaccinated will always be legitimate.” Tr. 90.

         In contrast to Dr. Höke’s indefinite timeline, Dr. Vartanian explained that “if [someone is]
susceptible to autoimmunity following an immunization, [the question is] not what [that person’s]
. . . minimal titer requirement is at some distant time point.” Tr. 121. Instead, the timeline is
driven by “the kinetics of [what happens] after immunization, when [the person first] achieve[s]
that . . . minimally[-]required titer, because at that point is when symptoms occur.” Id. He
explained that a person “can have a super high titer and then drop to one-fiftieth . . . or one-tenth
of that titer.” Id. at 121-22. While those lower levels “might still be sufficient,” in that they may
remain above the person’s minimum-susceptibility titer level, the person would have “had it [that
titer amount] earlier,” before the titer peaked and dropped off. Id. at 122. Thus, Dr. Vartanian
explained that an autoimmune response mediated by molecular mimicry, if it is going to occur,
will occur at “right around” peak concentration, at the point where the minimally-required titer
level is first achieved. Id. He explained that any incident of autoimmunity at sixty days post-
vaccination is “an outlier,” and he “imagine[s] that [the 60-day cutoff] came to be to make sure
that we were capturing beyond -- beyond question most -- the majority of cases.” Id. at 130.

        Dr. Vartanian went further and also explained Petitioner’s misplaced reliance on the bell
shape of the animal model graph that he had drawn earlier in his testimony. Tr. 123; Resp’t Ex. K
(bottom graph). Noting that care must be taken when extrapolating from animal models, Dr.
Vartanian explained that the graph he drew was a measure of the severity of an immune response
and not a graph representing the “frequency of disease onset.” Id. at 124. He explained that the
animals would “hav[e] their onset all at approximately the same time,” but then they would
continue to have the disease.” Id. Dr. Vartanian stated that “the onset isn’t variable. The onset is
really reliable.” Id. at 124. Thus, it is not that, as Petitioner’s counsel suggested, the onset of
disease occurs in “some [people] a bit earlier and some [people] a bit later” after peak immune
response. Id. at 123. Instead, it is the severity of the resulting disease that follows the bell-shaped
curve. Id. at 124. He emphasized that it is “very, very reliable” that onset of disease will cluster
at or near peak. Id.

        Dr. Höke did not offer a rebuttal to Dr. Vartanian’s explanation of peak immune response
and disease onset, which is consistent with other molecular mimicry-based causation theories
previously asserted in the Program with successful results. Ultimately, the time lapse between the
vaccination and the onset is significant, because from what is known about the human immune
system, a response to a particular antigen will occur within a fairly consistent time frame following
exposure. Accepting Dr. Höke’s theory would require a finding that certain symptoms occurring
at any time after vaccination can be connected back to the vaccination. This would essentially
“render[] Althen’s third prong a nullity[, where] any conceivable timing could qualify as an

                                                  35
appropriate temporal relationship.” Hennessey v. Sec’y of Health & Human Servs., 91 Fed. Cl.
126, 141 (2010).

       Dr. Höke and Dr. Vartanian agree that Petitioner’s symptoms began more than 60 days
following vaccination. Using a preponderant standard, that time frame is too long to be consistent
with the molecular theory proposed by Dr. Höke, his opinion on onset timing notwithstanding.

        VI.    Conclusion

        There is no dispute that Petitioner has suffered greatly as a result of the severe and swift
onset of her TM. She and her family have endured numerous trials, and there will certainly be
additional challenges as they continue to adjust to a new way of life. Her claim was brought in
good faith, and her strength in recounting these difficult years is to be commended. However,
despite a deep sympathy and empathy for what Petitioner has been through, this decision must not
take into account any personal feelings or emotions that these cases often evoke. Instead, it must
reflect a thorough analysis of the evidence and a thoughtful balance against the applicable legal
standards based upon probative weight and persuasiveness. Petitioner has not established by a
preponderance of the evidence that her Hep B vaccination caused her TM. Therefore, I must
DENY entitlement in this case.

       In the absence of a timely-filed motion for review filed pursuant to Vaccine Rule 23, the
Clerk of the Court is directed to ENTER JUDGMENT consistent with this decision.

       IT IS SO ORDERED.

                                              s/Herbrina D. Sanders
                                              Herbrina D. Sanders
                                              Special Master

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