Court Opinion

ID: 4236166
Source: CourtListenerOpinion
Date Created: 2018-01-11 21:04:10.977757+00
Date Added: 2024-06-11T14:43:01.710114
License: Public Domain

In the United States Court of Federal Claims
                                    OFFICE OF SPECIAL MASTERS
                                             No. 14-191V
                                           (to be published)

*************************
KYLE CARDA and SHANNON CARDA, *
on behalf of G.J.C.,              *
                                  *
                     Petitioners, *                                      Filed: November 16, 2017
                                  *
               v.                 *
                                  *                                      Decision; Entitlement; Dismissal of
SECRETARY OF HEALTH               *                                      Claim; Rotavirus (“RotaTeq”)
AND HUMAN SERVICES,               *                                      Vaccine; Intussusception.
                                  *
                     Respondent.  *
                                  *
*************************

Robert D. Trzynka, Cutler & Donahoe, LLP, Sioux Falls, SD, for Petitioners.

Sarah C. Duncan, U.S. Dep’t of Justice, Washington, DC, for Respondent.

                                DECISION DENYING ENTITLEMENT1

        On March 6, 2014, Kyle and Shannon Carda filed a petition on behalf of their minor child,
G.J.C., seeking compensation under the National Vaccine Injury Compensation Program (the
“Vaccine Program”).2 Petitioners allege that G.J.C. suffered from intussusception as a result of
receiving two doses of the RotaTeq (rotavirus) vaccine on January 23, 2013, and March 26, 2013,
respectively. Petition (“Pet.”) (ECF No. 1). An entitlement hearing was held on January 24-25,
2017, and the parties thereafter filed post-hearing briefs. ECF Nos. 84, 88, 89.

1
  This decision will be posted on the United States Court of Federal Claims website, and in accordance with the E-
Government Act of 2002, 44 U.S.C. § 3501 (2012). This means the ruling will be available to anyone with access
to the internet. As provided by 42 U.S.C. § 300aa-12(d)(4)(B), however, the parties may object to the published
decision’s inclusion of certain kinds of confidential information. Specifically, under Vaccine Rule 18(b), each party
has fourteen days within which to request redaction “of any information furnished by that party: (1) that is a trade
secret or commercial or financial in substance and is privileged or confidential; or (2) that includes medical files or
similar files, the disclosure of which would constitute a clearly unwarranted invasion of privacy.” Vaccine Rule 18(b).
Otherwise, the whole decision will be available to the public in its current form. Id.
2
 The National Vaccine Injury Compensation Program comprises Part 2 of the National Childhood Vaccine Injury Act
of 1986, Pub. L. No. 99-660, 100 Stat. 3755 (codified as amended at 42 U.S.C. § 300aa-10 through 34 (2012))
[hereinafter “Vaccine Act” or “the Act”]. Individual section references hereafter will be to § 300aa of the Act.
        After considering the record as a whole and the testimony at hearing, I find that Petitioners
have failed to carry their burden establishing causation, and therefore DENY their request for
compensation under the Vaccine Program. Petitioners have not established that G.J.C.’s second
RotaTeq dose was temporally close enough in time to his intussusception two months later to be
causal, nor have they demonstrated that the first and second doses, whether in concert or separately,
could cause a child to experience a series of undiagnosed “transient” or chronic intussusceptions,
later culminating in one sufficiently acute to require surgical intervention.

    I.    Factual Background

          Birth and Initial Medical History

        G.J.C. was born to the Cardas on November 22, 2012, at 39 1/7 weeks gestation, via
spontaneous labor after an “uncomplicated pregnancy.” Ex. 2 at 7; Ex. 3. Mrs. Carda’s medical
records noted, however, that she experienced positive gestational diabetes and decreased fetal
movements during the pregnancy. See, e.g., Ex. 1 at 8, 51, 59. G.J.C.’s Apgar scores at birth were
8 at 1 minute and 10 at 5 minutes. Ex. 2 at 7; Ex. 3. On November 29, 2012, G.J.C. was seen for
his one-week well-child examination by Dr. Aaron Zylstra at Sanford Children’s Clinic in Sioux
Falls, South Dakota. Ex. 4 at 2-4. The Cardas voiced no concerns about his behavior or
development, and his examination was normal. Id. He was noted to be eating three ounces of
formula every three hours. Id.

        G.J.C. returned to Sanford Children’s Clinic on January 23, 2013, for his two-month well-
child examination. Ex. 4 at 11-14. Again, he was reported to be a happy and healthy baby, and
there were no concerns expressed by the Cardas about anything specific. Id. G.J.C. had begun to
take four to five ounces of formula every three to four hours, and he had multiple wet diapers per
day. Id. At this visit, G.J.C. received his first doses of the Pentacel,3 pneumococcal, RotaTeq,4 and
Hepatitis B vaccines. Id.

3
 Pentacel is a combination of the Diphtheria-Tetanus-acellular Pertussis, IPV, and Hib vaccines. Dorland’s Illustrated
Medical Dictionary 1406 (32nd ed. 2012) (hereinafter Dorland’s).
4
    RotaTeq is a live strain attenuated vaccine. Rotavirus Vaccine, Live (Oral), Mayo Clinic,
https://www.mayoclinic.org/drugs-supplements/rotavirus-vaccine-live-oral-route/description/drg-20071625               (last
visited Oct. 30, 2017). This kind of vaccine contains a living, weakened strain of the disease virus, and is used to elicit
a stronger antibody response. Types of Vaccines, HHS, https://www.vaccines.gov/basics/types/index html (last visited
Oct. 30, 2017). Generally, live strain vaccines create lifelong immunity after one or two doses. Id.
                                                            2
        Feeding Concerns After First RotaTeq Dose

        Mrs. Carda called Sanford Children’s Clinic on March 6, 2013 (approximately six weeks
after administration of the first RotaTeq dose), to report her concerns that G.J.C. was now eating
less formula (three to four ounces instead of five), although he was still having “plenty” of wet
diapers. Ex. 4 at 22. The nurse explained that there was no reason for concern at this point unless
his intake continued to decrease. Id. A week later, on March 15, 2013, Mrs. Carda called again
because she had switched G.J.C.’s formula to a soy brand, and he was now experiencing harder
stools and constipation. Id. at 27. She was informed that this was typical when switching from
milk to soy, and that his stools should improve. Id. The nurse also informed her that if he arched
his back, ceased bowel movements, or developed abdominal distension, she should follow up with
the hospital. Id. The records from this period make no reference to any extreme or notable reaction
to the vaccines G.J.C. had received on January 23rd, although (as discussed below) the Cardas
maintain that they began to see concerning changes in G.J.C. within this two-month period.

        Thereafter, G.J.C. presented for his four-month well-child check-up on March 26, 2013.
Ex. 4 at 32-33. His parents now reported that he had been a frustrating eater over the last month
and would seem to fuss and arch his back during feedings. Id. However, they also noted he had
not been spitting up too much and was still a happy baby. Id. G.J.C. had multiple wet diapers and
daily hard stools. Id. The notes reveal that G.J.C.’s development for most areas was on schedule.
Id. at 35-36. At this visit, he was prescribed an antacid (Prilosec5) for Gastroesophageal Reflux
Disease (“GERD”), to be taken 20 to 30 minutes prior to feeding. Id. at 47. G.J.C. also received
his second dose of the Pentacel, pneumococcal, and RotaTeq vaccines. Id. at 33.

        Medical Problems After Second RotaTeq Dose

        Almost three weeks after administration of the second RotaTeq dose, Mrs. Carda called
Sanford Children’s Center on April 15, 2013, to report that G.J.C. was exhibiting a “concerning”
decreased appetite. Ex. 4 at 43-52. She specifically noted that he would refuse his bottle, and that
he ate only eight to ten ounces of formula the previous day. Id. at 44. He was allegedly having
fewer wet diapers, although he was not losing any weight. Id. Dr. Zylstra noted that reflux issues
similar to G.J.C.’s were likely attributable to an infant not eating much. Id. at 43. He suggested
that they change G.J.C.’s anti-reflux medication and formula, as well as perform an upper
gastrointestinal exam (“UGI”) to rule out any more serious but unidentified problems. Id. Mrs.
Carda agreed to schedule a UGI the following day, and asked to bring G.J.C. in for an examination
as well. Id.

5
  Prilosec is a trademark name for a preparation of omeprazole, which is a proton pump inhibitor used to treat
gastroesophageal reflux disease and administered orally. Dorland’s at 1319, 1514.

                                                      3
        The examination noted that G.J.C. had a sore on his left lower lip. Ex. 4 at 50. Although
he appeared to be gaining weight appropriately, Mrs. Carda reported that he had been experiencing
constipation for four months that had worsened since switching to a soy formula. Id. G.J.C. was
diagnosed with GERD and herpangina.6 Id. The assessment plan noted that he should continue to
take Prilosec daily to treat his GERD symptoms, and also that Mrs. Carda should add Karo syrup
to his bottles in order to relieve constipation. Id. Dr. Rosanne Bosch also recommended that G.J.C.
stop receiving soy formula due to a mild rash and his constipation. Id. The UGI results were
obtained a day later, on April 17, 2013, and confirmed the existence of reflux but identified no
anatomic problems that might be contributing to G.J.C.’s GERD. Id. at 48; Ex. 6 at 68.

        Intussusception and Surgical Intervention

        A little over a month later, on May 22, 2013, Mrs. Carda contacted Sanford Children’s
Clinic to inquire about G.J.C.’s lethargy and inability to eat or keep anything down. Ex. 4 at 63.
She now reported that he was vomiting and dehydrated, and sought to bring him in to be evaluated
by Dr. Zylstra. Id. at 63, 69. The medical report from this visit noted that per Mr. and Mrs. Carda’s
recollection, G.J.C. had evinced a decreased appetite the previous day that gradually worsened. Id.
The Cardas also reported that he had experienced increased reflux issues over the past month. Id.
Mr. Carda specifically stated that G.J.C. looked like he was experiencing heartburn or reflux after
he ate, and that he would vomit within one hour after eating. Id. They also reported, however, that
since switching G.J.C.’s formula to Gentlease, his constipation had greatly improved. Id. Dr.
Zylstra observed that G.J.C. looked well and well-hydrated, despite the report of decreased “UOP”
(urine output). Id. at 69. He opined that there might be an acute viral process occurring in addition
to G.J.C.’s reflux, and correspondingly increased the Prilosec dosage. Id. G.J.C. was then sent
home. Id.

        Later in the afternoon of May 22, 2013, according to Mrs. Carda, G.J.C. began to look even
worse, and Mrs. Carda’s sister convinced her to bring him back to the hospital. Tr. at 338. Upon
arrival, G.J.C. was determined to be dehydrated and given an IV with fluids. Ex. 6 at 81. Mrs.
Carda testified that she next saw G.J.C. “vomiting feces and bile” (Tr. at 109-11), although the
medical records from that visit state that Mrs. Carda produced to treaters a blanket with “numerous
areas of brownish-green spit-up” that were not very big. Ex. 6 at 117. Those same
contemporaneous medical records do not reflect any independent treater observing feces stains of
the kind reported.

6
  Herpangina is an acute infectious disease caused by either group A or B coxsackievirus or echoviruses, chiefly
affecting young children in the summer. Dorland’s at 852. It is characterized by vesiculoulcerative lesions on the
mucous membranes of the throat, plus dysphagia, vomiting, and fever. Id.

                                                        4
        The Sanford treaters performed an x-ray revealing a bowel obstruction. Ex. 6 at 84. G.J.C.
then underwent an abdominal ultrasound to ascertain the cause of the obstruction. Id. at 81. The
ultrasound revealed right targetoid lesions, indicating that G.J.C. was experiencing an
intussusception (meaning intestinal obstruction) in his small bowel. Id. at 85.

        In order to treat the intussusception, an air enema reduction was performed, but it was only
partially successful. Ex. 6 at 84, 151. Due to the incomplete reduction, on May 23, 2013, G.J.C.
underwent a laparotomy,7 followed by an open reduction with manual manipulation. Ex. 6 at 78-
79, 84-85. During this surgery, G.J.C. also received an appendectomy. Id. at 228. The procedure
was ultimately successful, and G.J.C. recovered well, though he had a slow return of bowel
function. Id. There is no indication from the procedure notes that the surgeon removed any portion
of G.J.C.’s small bowel. See id.

           Subsequent Related Sequelae

        On May 28, 2013, G.J.C. returned to Sanford Medical Center due to continued pain and
complaints from the Cardas that he was not eating or sleeping well. Ex. 6 at 85, 89. Abdominal x-
rays revealed the presence of a large amount of free air, and G.J.C. had abdominal distention and
lethargy. Id. at 39, 143-48. Dr. Jon Ryckman recommended another exploratory laparotomy with
possible bowel resection and stoma creation. Id. at 85, 89. During this surgery, two small
perforations were identified in the small bowel: one underneath the incision from the previous
surgery, and one iatrogenic serosal tear. Id. These were repaired, and it was noted that G.J.C.’s
bowel otherwise appeared fine and healthy. Id. G.J.C. was discharged on June 2, 2013, after
recovering from his surgeries. Id. at 228.

       From June 4-6, 2013, G.J.C. was again admitted to Sanford Medical Center for poor
feeding, irritability, and a possible bowel obstruction. Ex. 6 at 1053-57. He was diagnosed with
dehydration and narcotic withdrawal, but no recurrent intussusception was noted. Id.

        G.J.C.’s next significant medical visit was to Sanford Children’s Specialty Clinic to Dr.
Jones-Sapienza on June 14, 2013, for surgical follow-up and routine post-operative care. Ex. 5 at
1. He was determined to be fine and tolerating his diet, and was voiding and stooling without
difficulties. Id. Dr. Jones-Sapienza did inform the Cardas of G.J.C.’s lifelong possibility of
additional adhesive bowel obstructions, however, advising them to continue to monitor him for
abdominal distention or bilious emesis. Id.

7
    A laparotomy is defined as a surgical incision into the abdominal cavity. Dorland’s at 1005.

                                                            5
        G.J.C. next had a six-month well-child visit with Dr. Zylstra on June 17, 2013, at which
time he was deemed to be recovering well despite some slight complications after surgery. Ex. 4
at 81. His parents reported that G.J.C. was taking four to six ounces of Gentlease formula every
four to five hours. Id. Mrs. Carda also called back the next day, June 18th, due to concern that
G.J.C. was eating less after surgery, though she did not think he looked ill or uncomfortable. Ex.
5 at 9. Dr. Jones suggested that she continue to watch him for any further worrisome signs and to
bring him to the emergency department if his symptoms worsened. Id. The medical record contains
no additional materials relevant to G.J.C.’s claim after this date.

 II.     Fact Witness Testimony

       Both Kyle and Shannon Carda testified in person at the entitlement hearing, and also
provided witness affidavits. Tr. at 5-126, 321-54; ECF No. 5.

       A.      Shannon Carda

        Mrs. Carda confirmed most of what is reflected in the medical records, specifically
testifying to the fact that G.J.C. was a healthy baby prior to his RotaTeq vaccinations and that he
had never experienced problems with pain or spitting up until after vaccination. Tr. at 7-8.
Importantly, however, and in contrast to the records, Mrs. Carda testified that G.J.C. began to
experience a reaction in the days and weeks after his first RotaTeq vaccination on January 23rd,
characterized by “forceful vomiting,” eating less, arching his back, and tensing up while he was
playing, which worsened after his second vaccination on March 26th. Id. at 9-10, 14-15. She also
reported that G.J.C. became more and more lethargic, and would wake up screaming in pain during
the night. Id. at 19.

        Mrs. Carda further testified that when G.J.C. was admitted to the hospital on May 22, 2013
(Ex. 6 at 83), he was so dehydrated that it took several nurses multiple attempts to place the IV.
Tr. at 23. She also asserted, as noted above, that during this visit he was vomiting feces and bile.
Id. at 109. When challenged as to why the medical records did not reflect her contention (and in
fact contradict the claim that bile or feces were observed in G.J.C.’s vomit), Mrs. Carda speculated
that he may have done this after the treater’s observation (but the occurrence was not formally
recorded). Id. at 111.

        A general subject of Mrs. Carda’s cross-examination was the disparity between her
recollection of events and the actual medical records. Mrs. Carda repeatedly stated that she could
not explain why the records did not reflect her current recollections, and expressed frustration that
treaters had not recorded the facts as she recalled them. See, e.g., Tr. at 45, 47-48, 56 (“[B]ut this
isn’t me writing this down. This is what the nurse and the doctors have put into the medical records.
                                                  6
So what I say and how they describe it could be completely different.”), 108. She asserted that she
had expressed her concerns about G.J.C. in detail to his medical providers as they were occurring,
but that the treaters may have failed to take her seriously or to have accurately recorded her
observations. Id. at 115-17. At the same time, she proposed that she may not have adequately
informed treaters of what she was observing with G.J.C. because her husband, friends, and even
the medical professionals kept assuring her that these were normal symptoms for a baby and that
he was perfectly healthy. Id. at 40-42, 84.

        Mrs. Carda otherwise testified that after the second revision surgery, G.J.C. returned to
normal and had no further issues feeding, and has since not required Prilosec or GERD medication.
Tr. at 25-27.

        B.     Kyle Carda

        Mr. Carda’s testimony echoed the content of his wife’s testimony. Mr. Carda noted that he
 was very involved in G.J.C.’s care, and that the Cardas often scheduled G.J.C.’s appointments
 around Mr. Carda’s work schedule. Tr. at 322-23. However, he was less able to recall dates and
 details, deferring to his wife’s testimony and recollection. Id. at 333. Like Mrs. Carda, Mr. Carda
 also maintained that the contemporaneous medical records did not accurately reflect G.J.C’s
 symptoms, asserting that treaters had not taken the Cardas seriously, and/or had assumed that
 G.J.C.’s symptoms were attributable to GERD. Id. at 336, 346. Mr. Carda also testified that Dr.
 Jon Rykman, the surgeon who performed G.J.C.’s reduction, was the individual who first
 explained to them the possibility that G.J.C.’s intussusception could have been related to his
 RotaTeq vaccination (although it does not appear that this treater was informed when G.J.C. had
 received either RotaTeq dose). Id. at 352.

 III.    Expert Testimony

       Both sides offered two experts at hearing, as well as their written expert reports. The
opinions and testimony of the relevant experts are set forth below.

        A.     Dr. John Santoro

         The first of Petitioners’ two experts, John Santoro, M.D., filed two written reports and
testified via videoconference at hearing. See Expert Report, dated Dec. 15, 2014, filed as Pet.’s
Ex. D (ECF No. 15-1) (“First Santoro Rep.”); Expert Report, dated May 12, 2015, filed as Pet.’s
Ex. M (ECF No. 23-1) (“Second Santoro Rep.”). Dr. Santoro opined that the RotaTeq vaccinations
G.J.C. received caused or significantly contributed to his intussusceptions.

                                                 7
        Dr. Santoro currently works at Atlantic Gastroenterology Associates, P.A. as a doctor of
osteopathic medicine and gastroenterology. See Santoro CV (ECF No. 68-1) at 1; Tr. at 131. He
obtained his Bachelor of Arts in biology from LaSalle College in 1973, and his M.D. from
Philadelphia College of Osteopathic Medicine in 1978. Santoro CV at 1. He completed an
internship at John F. Kennedy Memorial Hospital from 1978-79, and performed his residency in
internal medicine at the University of Medicine and Dentistry at the NJ School of Osteopathic
Medicine from 1979-81. Id. Dr. Santoro also completed a fellowship in gastroenterology at the
University of Medicine and Dentistry NJ School of Osteopathic Medicine from 1981-83. Id. at 2.
He is board certified in internal medicine and gastroenterology. Id. Additionally, he serves as a
clinical associate professor of medicine at Rowan University School of Osteopathic Medicine. Id.
at 3.

         As a gastroenterologist, Dr. Santoro testified that he spends 95 percent of his time seeing
patients, with the remaining five percent dedicated to clinical research and teaching. Tr. at 131.
While part of his rotation involved pediatric gastroenterology, he more commonly sees patients
above the age of 11, and does not treat infants and younger children, although he has experience
treating children with GERD and has also experienced two patients with acute intussusception. Id.
at 150-53. Dr. Santoro has published multiple articles in gastroenterology journals. Id. at 4-5. He
is not, however, an immunologist.

         At hearing, Dr. Santoro explained intussusception to be the telescoping of the intestine in
upon itself, creating a bowel obstruction. Tr. at 134. An ileocolic intussusception is, he opined, the
proper classification for G.J.C.’s intussusception. Id. at 198. As Dr. Santoro explained, the ileum
is the last section of the small bowel, and thus an ileocolic intussusception occurs at that location,
when the ileum inverts into the large bowel. Id. at 199. Dr. Santoro did not distinguish between a
small bowel intussusception and ileocolic intussusception. Id. at 197.

        Although Dr. Santoro noted that the Petitioners’ other expert, Dr. Yehuda Shoenfeld,
would testify as to the immunologic mechanisms that could theoretically result in a vaccine-
induced intussusception, he nevertheless covered the topic somewhat in his testimony. Dr. Santoro
maintained that the RotaTeq vaccine was capable of producing a lymphadenopathy8 in the ileum,
causing a small-bowel intussusception akin to what G.J.C. experienced. Tr. at 145. In effect, an
inflammatory infection or disturbance could cause edema, or swelling, in the bowel wall, later
resulting in G.J.C.’s symptoms and eventual acute intussusception. Id. He did not find it notable
that G.J.C.’s intussusception followed his second rather than first dose of the vaccine, opining that
the second dose can be more “intense” due to an anamnestic (immunologic memory) response. Id.
In his opinion, there was no other possible explanation for what had occurred. Id. at 146.

8
    Lymphadenopathy is defined as a disease of the lymph nodes, usually coupled with swelling. Dorland’s at 1083.

                                                          8
       To support his causation theory, Dr. Santoro recalled the historical link between an earlier
version of the rotavirus vaccine (Rotashield) and intussusception. First Santoro Rep. at 5.
Rotashield was eventually pulled from the market and is no longer administered to infants. Id. Dr.
Santoro also explained that there have been hundreds of “confirmed” intussusception events
following administration of the RotaTeq vaccine reported to VAERS.9 Id. at 6.

        Dr. Santoro also relied on several articles suggesting a link between other versions of the
vaccine and intussusception. For instance, a study performed in Mexico found that a different
rotavirus vaccine (RV-1) was associated with a short-term risk of intussusception in roughly one
of every 51,000 to 68,000 vaccinated infants. First Santoro Rep. at 5, citing Patel et al.,
Intussusception Risk and Health Benefits of Rotavirus Vaccination in Mexico and Brazil, 364 New
Eng. J. Med. 2283, 2283 (2011), filed as Ex. 12-1 (ECF No. 70-1). He similarly offered an article
studying intussusception risk after receipt of the RV-1 monovalent rotavirus vaccine. First Santoro
Rep. at 5; see also Weintraub et al., Risk of Intussusception after Monovalent Rotavirus
Vaccination, 370 New England J. Med. 513, 513-19 (2014), filed as Ex. 12-14 (ECF No. 70-
14)(“Weintraub”). Weintraub observed a significant increase in the rate of intussusception
following vaccination; after two doses of the vaccine, the estimated risk was noted as 5.3 per
100,000 infants. First Santoro Rep. at 5. Another piece of literature considered the connection
between intussusception and RV-5 in the United States. Id. at 6-7, citing Yih et al., Intussusception
Risk after Rotavirus Vaccination in U.S. Infants, 370 New Eng. J. Med. 503, 503-13 (2014), filed
as Ex. 12-13 (ECF No. 70-13) (“Yih”). Yih concluded that approximately 1.5 cases of
intussusception occurred per 100,000 recipients of the first dose.

        Beyond proposing that RotaTeq could cause an intussusception, Dr. Santoro grappled with
the medical record in an effort to show how, in G.J.C’s case, his proposed theory had actually
unfolded.10 In particular, he attempted to reconcile his theory with the facts that (a) K.J.C. never
experienced an intussusception requiring surgical intervention after his January 23rd receipt of the
first RotaTeq dose, and (b) approximately eight weeks passed from G.J.C.’s second RotaTeq
vaccination and his acute intussusception. To do so, Dr. Santoro attempted to delineate a form of
intussusception separate from its commonly-understood acute form – a chronic, or transient,

9
  The Vaccine Adverse Event Reporting System (“VAERS”) is a national warning system designed to detect safety
problems in U.S.-licensed vaccines. See About VAERS, VAERS, https://vaers hhs.gov/about html (last visited Sept.
26, 2017). It is managed by both the CDC and the FDA. VAERS monitors and analyzes reports of vaccine related
injuries and side effects from both healthcare professionals and individuals.

10
   Significantly, at trial Dr. Santoro had difficulty explaining the evidentiary bases for certain fact statements in his
written reports about G.J.C.’s medical history. When confronted with discrepancies between his recitation of the
medical history and the actual record, he blamed them on the fact that the reports had been written years before the
hearing. See, e.g., Tr. at 159-60. Further, Dr. Santoro admitted he had incorrectly stated in his report that G.J.C.’s
intussusception surgery included a bowel resection, when in fact the records establish that no portion of G.J.C.’s colon
was removed in surgically correcting the intussusception. Id. at 166-67.

                                                           9
intussusception. Tr. at 134-35. In his opinion, G.J.C. had been experiencing less severe forms of
intussusception that were ongoing, or chronic, from the time of his first RotaTeq dose – not severe
enough to require invasive surgical attention but nevertheless related to the vaccine, and
culminating in the May 23, 2013, surgery, when the problem had become sufficiently acute. Id. at
136, 180.

        For support, Dr. Santoro relied on an article that studied transient/chronic intussusceptions
observing symptoms similar to what G.J.C. is said to have experienced, such as abdominal pain,
vomiting, and abdominal distension. Tr. at 135-36; see Mateen et al., Transient Small Bowel
Intussusceptions: Ultrasound Findings and Clinical Significance, 31 Abdominal Imaging 410,
410-16 (2006), filed as Ex. 12-27 (ECF No. 70-27) (“Mateen”). Mateen was a review study noting
instances in which spontaneously-resolving small bowel intussusceptions were incidentally
discovered in children by medical treaters, in the course of treating some other abdominal
complaint. Mateen at 410. All resolved without the need for surgical intervention, but none
recurred thereafter, and in no instances were treaters able to identify the pathologic source of the
detected resolved intussusception. Id. at 413-14. Mateen’s authors concluded that these one-time,
transient intussusceptions had “no clinical significance as they reduce spontaneously and their
presence warrants only conservative observation.” Id. at 416.

        Dr. Santoro also referenced a case study of a child who presented to medical treaters with
distinct episodes of pain. Tr. at 137-38; see Steffen et al., Intermittent Intussusception as a Cause
of Abdominal Pain in Children, 118 Am. Gastroenterological Ass’n A1073 (2000), filed as Ex.
12-22 (ECF No. 70-22)(“Steffen”). As discussed in Steffen, an ultrasound ultimately revealed the
child had likely experienced an undiagnosed intussusception, suggesting to Dr. Santoro that
instances of ongoing abdominal pain or related symptoms might reflect the existence of some
ongoing transient intussusception. Tr. at 138. While Dr. Santoro allowed for the fact that such
chronic intussusception is rare, he argued it remained possible, relying on literature from 1976 that
proposed that chronic intussusception was a plausible explanation for children experiencing
persistent, otherwise-unexplained abdominal problems. Second Santoro Rep. at 2, citing Rees &
Lari, Chronic Intussusception in Children, 63 Br. J. Surgery 33, 33-35 (1976), filed as Resp’t’s
Ex. D.7 (ECF No. 65-7).

        In so opining, Dr. Santoro attacked the notion that G.J.C.’s documented GI-related
symptoms in the months prior to his May 23rd surgery reflected feeding problems or GERD.
Second Santoro Rep. at 1-2; Tr. at 191-92. GERD, Dr. Santoro opined, often presents in infants as
fussiness at feeding time, with crying and/or regurgitating after feeding. Tr. at 188-89. GERD
would not feature arching of the back. Id. at 189. But in his view, G.J.C.’s presentation was acute
in precisely this manner, characterized as well by significant abdominal pain and other severe
symptoms evident (at least based on witness testimony rather than records) from around the time
of the first vaccine dose. Id. at 179-81, 186-87. At bottom, although G.J.C.’s treaters might have
                                                 10
relied on medical common sense in assuming that his symptoms were not unusual, in this case
they reflected something far less often encountered. Id. at 142 (“[w]hen you hear hoof beats, think
of horses, but often those hoof beats are really zebras, and in this case, it wasn’t a horse; it was a
zebra”).

        Dr. Santoro also proposed that the unsuccessful treatment of G.J.C.’s GERD further
excluded it as an explanation. Once pediatric treaters determined that GERD was interfering with
an infant’s feeding, they would commonly prescribe medications to address the symptoms rapidly
(perhaps as quickly as within a day). Id. at 189-90. But Prilosec never relieved G.J.C.’s symptoms.
Tr. at 146. The Prilosec treatment should have been far more efficacious in resolving his symptoms
had GERD been their source. Id. at 147.

         Dr. Santoro endeavored to explain the long passages of time between G.J.C.’s two RotaTeq
vaccinations and his ultimate surgical intervention. He maintained that G.J.C. experienced his first
transient/chronic small-bowel intussusception after the initial RotaTeq dose, with an additional
intussusception after the second dose, culminating in the acute intussusception in May. Tr. at 174-
75, 184. For support that this was medically reasonable, he largely relied on VAERS database
information. Ex. 12-17 at 4. And he rejected the assumption that G.J.C.’s actual intussusception
symptoms did not begin until May 21, 2013, characterizing the earlier symptoms displayed after
the first dose as proof of transient intussusception. Tr. at 179, 184.

        In proposing this timeframe to be medically acceptable, Dr. Santoro acknowledged that it
was largely understood in the medical community that acute intussusceptions following rotavirus
vaccinations would be expected to occur within two weeks of receiving the first dose -- something
that unquestionably did not occur in this case. First Santoro Rep. at 9. Dr. Santoro nevertheless
maintained that a vaccine-caused intussusception could still occur after the second or third dose as
well. Second Santoro Rep. at 3. When confronted with many articles that placed the highest risk
for intussusception three to seven days following vaccination within a 21-day risk period, Dr.
Santoro argued that the timeframe was arbitrary, and noted the existence of other reports of cases
of intussusception that occurred 78 days following vaccination. Tr. at 173-74, citing Haber et al.,
Intussusception After Rotavirus Vaccine Reported to US VAERS, 2006-2012, 131 Pediatrics 1042
(2013), filed as Ex. 12-17 (ECF No. 70-17). The fact that some cases occurred in a cluster
following the first vaccination did not in his opinion eliminate the possibility of later-occurring
post-vaccination cases. Id. at 174.

       B.      Dr. Yehuda Shoenfeld

       Petitioners’ second expert was Dr. Shoenfeld, who filed one expert report and also testified
at hearing. See Expert Report, dated Oct. 25, 2015, filed as Pet.’s Ex. A (ECF No. 28-1)
(“Shoenfeld Rep.”). Like Dr. Santoro, Dr. Shoenfeld opined that there was a causal link between

                                                 11
G.J.C.’s vaccinations and his intussusception, based upon the concept of a transient or chronic
intussusception later culminating in one sufficiently acute to require surgical intervention.

        Dr. Shoenfeld is currently the head of the Center for Autoimmune Diseases, which he
founded at the Sheba Medical Center in Israel. Shoenfeld CV (ECF No. 54-2). He is also the
incumbent of the Laura Schwarz-Kipp Chair for Research of Autoimmune Diseases at Tel Aviv
University. Id. His experience focuses on autoimmune and rheumatic diseases, and he has
published many peer-reviewed papers in journals and books on these topics. Id. He is on the
editorial board of 32 journals in the field of autoimmunity. Id. Unlike Dr. Santoro, Dr. Shoenfeld
lacks specialized expertise in gastroenterology and has no identified history of treating or
diagnosing pediatric patients with any such illnesses. Tr. at 242-43, 246.

         Dr. Shoenfeld’s expert report began with a summary of the medical records, followed by
his proposed causation theory. See generally Shoenfeld Rep. Dr. Shoenfeld maintained that there
is a relationship between the RotaTeq vaccine and intussusception demonstrated in the literature.
Id. at 6. He examined data on the RV-1 and RV-5 formulations of rotavirus, and noted that the
VAERS database received 108 confirmed intussusception reports following these vaccines from
February 2008 to December 2014.

         Dr. Shoenfeld also relied on two papers also cited by Dr. Santoro that he proposed
established a causal relationship. Shoenfeld Rep. at 7; see also Yih; Weintraub. The Yih study
found an increased risk of intussusception following vaccination with RotaTeq and Rotarix in the
United States. Shoenfeld Rep. at 7. That study involved only vaccinated children, and found that
excess cases of intussusception following the first dose of RV-5 was significantly elevated in the
21-day risk window. Id. Yih did not, however, find a significant increase in risk after doses two or
three for RV-5, although there was a significant risk after dose two of RV-1. Id. Thus, Yih
concluded that RV-5 was associated with 1.5 excess cases of intussusception per 100,000
recipients of the first dose. Id. The Weintraub study Dr. Shoenfeld referenced found that in a
vaccine post-licensure study of more than 200,000 doses of the monovalent rotavirus vaccine,
there was a significant increase in the rate of intussusception following vaccination. Id. at 8. The
risk following rotavirus vaccination with RV-5 is increased for three to seven days - mainly after
the first dose but only marginally after the second and third doses. Id. at 9. Thus, even though most
intussusceptions had occurred within two weeks following vaccination and usually after the first
dose, Dr. Shoenfeld opined that it could still occur after the second or third dose. Id.11

11
  Dr. Shoenfeld also included a section in his report that noted that RotaTeq was withdrawn from the market.
Shoenfeld Rep. at 9. However, this is incorrect - as the report states, it was the RotaShield vaccine that was found to
be associated with an increased risk of intussusception and its use was discontinued. Id.

                                                          12
         Based on the literature and studies, Dr. Shoenfeld maintained that there was a plausible
biologic mechanism linking the vaccination to G.J.C.’s intussusception. Shoenfeld Rep. at 9. As
he explained, the vaccine would cause the upregulation of cytokines with the capacity to inflame
and stimulate the smooth muscles of the bowel, resulting in increased movement or peristalsis. Tr.
at 230-32. This inflammation would then cause edema or swelling, which could later produce an
acute intussusception. Id. at 223-24. Dr. Shoenfeld expressly acknowledged, however, that he does
not understand intussusception to be an autoimmune illness (and therefore did not offer an opinion
in this case that G.J.C.’s condition was mediated by an autoimmune process). Id. at 245.

        To explain the timeframe in which the RotaTeq vaccine purportedly injured G.J.C. over
the four-month period between first dose and surgical intervention, Dr. Shoenfeld relied on the
concept of “challenge-rechallenge” often raised in Vaccine Program cases. Tr. at 221-22, 228.12
In effect, G.J.C.’s immune system, primed for a response to RotaTeq after receiving the first dose
in January 2013, experienced a more robust response after the March dose, logically explaining
the eventually acute intussusception experienced later that spring. Id. at 240. Dr. Shoenfeld did
not, however, explain how the apparent lack of undocumented symptoms in the first few weeks
after the second dose corroborated his opinion (or why the acute intussusception took a total of
over six weeks to manifest after the March 26th second dose).

        In Dr. Shoenfeld’s reading of the medical record, G.J.C.’s symptoms began within days
after the first vaccination and then progressed after the second dose. Based on the above literature
that he read as establishing a plausible mechanism, Dr. Shoenfeld opined that G.J.C.’s
intussusception was directly caused by the two RotaTeq vaccinations he received. Shoenfeld Rep.
at 10. Relying on literature that was based upon VAERS data, Dr. Shoenfeld proposed that up to
80 days could pass from a RotaTeq dose to an acute intussusception and still be medically
acceptable. Tr. at 294. Indeed – Dr. Shoenfeld allowed for four or even five months to pass between
vaccine receipt and intussusception and still be a medically reliable timeframe. Id. at 314.

     C. Dr. Neal Halsey

     Respondent submitted two reports from Dr. Halsey. See Expert Report, dated April 7, 2015
(filed as Resp’t’s Ex. A) (ECF No. 18-1) (“Halsey Rep.”); Supplemental Expert Report, dated July
18, 2016 (filed as Resp’t’s Ex. F) (ECF No. 43-1) (“Second Halsey Rep.”).

12
   Challenge-rechallenge is “a paradigm for exploring whether one substance caused an adverse reaction. Under this
model, an individual who has had an adverse reaction to the initial vaccine dose (the challenge event) suffers a
worsening of symptoms after a second or third injection (the rechallenge event.)” Viscontini v. Sec’y of Health &
Human Servs., No. 98-619V, 2011 WL 5842577, at *22 (Fed. Cl. Spec. Mstr. Oct. 21, 2011) (quoting Doe/70 v. Sec’y
of Health & Human Servs., 95 Fed. Cl. 598, 603 (2010) (quotations omitted)), mot. for review den’d, 103 Fed. Cl. 600
(2012).
                                                        13
    Dr. Halsey is currently a professor in the Departments of International Health and Pediatrics
at Johns Hopkins University. Halsey CV, filed as Resp’t’s Ex. B (ECF No. 20). In addition, he
serves as the director for the Institute for Vaccine Safety. Id. He received his undergraduate and
medical degrees from the University of Wisconsin. Id. He completed his pediatric residency at the
University of Colorado, and also performed an NIH residency in pediatric infectious diseases. Id.
He further served as an Academic Intelligence Officer in the Centers for Disease Control and
Prevention’s (“CDC”) Immunization Division. Id. Dr. Halsey is board certified in pediatrics and
pediatric infectious diseases. Although Dr. Halsey no longer sees patients regularly, he testified
that he has treated many thousands of children with the rotavirus illness. Tr. at 364. He further
testified that he has diagnosed six or seven children with intussusception, all under the age of two.
Id. at 365.

    Based on his review of G.J.C.’s medical records, Dr. Halsey maintained that the G.J.C.’s
intussusception was not the result of the rotavirus vaccine. Tr. at 393; Second Halsey Rep. at 3.
While Dr. Halsey agreed that RotaTeq can cause intussusception, he opined that any increased risk
of acute intussusception associated with the vaccine occurs almost exclusively within the first 21
days after vaccination. Tr. at 392. G.J.C., however, first presented with symptoms of
intussusception during the earlier hours of May 22, 2013, 57 days after his second vaccination. Id.
at 394-95. Dr. Halsey proposed intussusception beginning in such a timeframe was not medically
or scientifically plausible because “the virus doesn’t cause persistent changes in the gut that would
lead to intussusception at a later time.” Id. at 393, 405. Rather, RotaTeq contains live strains of the
rotavirus, and their peak period of replication is a shorter time, relatively speaking, than allowed
for by Petitioners’ theory. Id. at 400-01.

    For the same reason, Dr. Halsey rejected Petitioners’ argument (advanced by Dr. Shoenfeld)
that the concept of challenge-rechallenge could explain why G.J.C. experienced a more severe
reaction to RotaTeq after receipt of the second dose. Tr. at 408-09. In. Dr. Halsey’s view, although
a live virus vaccine like RotaTeq would be administered twice to ensure some immune response,
the response to a live virus vaccine would inherently be less robust in subsequent doses (Id. at 409)
– whereas with inactive or killed-virus vaccines, the second dose is more likely to produce a more
robust immunologic response (Id. at 408). Accordingly, Dr. Halsey felt that Dr. Shoenfeld was
misapplying challenge-rechallenge to the kind of vaccine at issue in this case.

    To support his opinion, Dr. Halsey relied on three papers establishing the risk interval of
intussusception following rotavirus vaccination. Dr. Halsey first offered an article concluding that
the increased risk of intussusception was highest between three to fourteen days following the
RotaShield vaccine, based on a case-control study comparing 429 infants diagnosed with
intussusception with 1,763 healthy infants in 19 states. See Murphy et al., Intussusception Among
Infants Given an Oral Rotavirus Vaccine, 344 New Eng. J. Med. 564 (2001), filed as Resp’t’s Ex.
A-12 (ECF No. 63-2) (“Murphy”); Tr. at 397-98. Dr. Halsey acknowledged that the Murphy paper
                                                  14
discussed intussusception risk following the RotaShield vaccine, which is no longer in use, rather
than the RotaTeq vaccine at issue in this case. Tr. at 397. However, Dr. Halsey explained that he
relies on the Murphy paper because it is the first study to document the time interval of increased
risk after any form of the rotavirus vaccine. Id.

     Dr. Halsey next referred to the Yih article (also filed by Petitioners and cited by their experts),
which he deemed the first article discussing an increased risk of intussusception following the
RotaTeq vaccine in U.S. infants. See Yih (filed by Respondent as Ex. D-8 (ECF No. 65-8)). Using
both a self-controlled risk interval and cohort design,13 Yih concluded that intussusception
symptoms following the rotavirus (RV5 and RV1) vaccine presented within seven to twenty-one
days after vaccination. Id. at 506; Tr. at 403. But Yih found no significant risk of intussusception
following a second or third dose. Yih at 506; Tr. at 407. Dr. Halsey also relied on an article
similarly observing that the main risk of intussusception fell in the days immediately after the first
dose. Halsey Rep. at 7; see Haber et al., Intussusception After Monovalent Rotavirus Vaccine—
United States, Vaccine Adverse Event Reporting System (VAERS), 2008-2016, 33 Elsevier 4873,
4873 (2015), filed as Resp’t’s Ex. D-10 (ECF No. 65-10) (“Haber”). Based on such studies, Dr.
Halsey opined that there is no meaningfully increased risk for intussusception beyond 21 days after
receipt of the first initial dose of rotavirus vaccine. Tr. at 404; Halsey Rep. at 6; Second Halsey
Rep. at 1.

    Dr. Halsey also dismissed Petitioners’ argument that G.J.C.’s feeding problems, or GERD
symptoms, were consistent with chronic/transient intussusception. Dr. Halsey categorized GERD
as a common pediatric diagnosis involving spitting up, vomiting, irritability, feeding refusal, and
poor weight gain. Tr. at 390; Halsey Rep. at 5. According to Dr. Halsey, GERD symptoms can
also include regurgitation, arching of the back, and pain associated with acidic reflux in the
esophagus. Tr. at 390-91. G.J.C.’s symptoms, including reflux, regurgitation, and esophageal pain
and discomfort, were not consistent with intussusception. Id.; Halsey Rep. at 5. Rather, G.J.C. first
presented with the kind of severe symptoms associated with intussusception no sooner than May
22, 2013. Tr. at 393-94.

    In response to Petitioners’ chronic/transient intussusception theory, Dr. Halsey opined that
intussusception is understood in the medical community to be primarily an acute, life-threatening
illness as opposed to an insidious chronic health problem. Halsey Rep. at 5. Dr. Halsey
acknowledged that there is medical literature in existence discussing the possibility of minor,

13
   A cohort study is a type of epidemiologic study where groups of individuals can be identified as exposed to the
agent or agents hypothesized to have caused a disease or other outcome. Reference Manual on Scientific Evidence 621
(3rd ed. 2011). A cohort method involves observing populations over a certain number of years in order to generate
reliable scientific evidence showing if an exposed group is likely to develop a disease. Id. Cohort studies generally
require a large population study over a long period of years. Id.

                                                        15
transient invagination of the small bowel that resolves without medical intervention (and that may
not always be discovered), but maintained that this kind of minor invagination would not be
expected or understood to evolve into an acute intussusception. Tr. at 437-38; 447. Indeed,
according to Dr. Halsey, an invagination is a normal phenomenon that occurs in all people
involving no pathologic mechanism. Id. at 445; Halsey Rep. at 5. Dr. Halsey testified that no
studies analyzing the relationship between “temporary” invagination and the rotavirus vaccine
exist, making it impossible to opine as to whether the rotavirus vaccine could even cause a
“temporary” invagination. Id. at 448. Ultimately, Dr. Halsey refused to accept the theory as
medically reliable, stating that he is not convinced “transient intussusception” is a real
phenomenon despite its brief mention in some of the literature filed by Petitioners. Id. at 438,
453.14

     D. Dr. Chris Liacouras

        Dr. Liacouras served as Respondent’s second expert. See Expert Report, dated Jan. 7, 2016
(filed as Resp’t’s Ex. D) (ECF No. 31-1) (“Liacouras Rep.”). He is currently a professor of
pediatrics and pediatric gastroenterology and nutrition at the Perelman School of Medicine at the
University of Pennsylvania, Children’s Hospital of Philadelphia. Liacouras CV, filed as Resp’t’s
Ex. E (ECF No. 31); Tr. at 506. Dr. Liacouras received his undergraduate degree from Johns
Hopkins and his medical degree from Harvard Medical School. Tr. at 501. During medical school,
Dr. Liacouras completed a pediatric gastroenterology fellowship at Children’s Hospital of
Philadelphia. Id. at 502. Since then, he has remained at Children’s Hospital of Philadelphia, serving
in various capacities, including director of the Gastrointestinal Endoscopy Suite, and a full
professor of pediatrics and pediatric gastroenterology. Id. Dr. Liacouras is board certified in
pediatric gastroenterology, and maintains an active medical license in the State of Pennsylvania.
Id. at 506.

       Dr. Liacouras testified that he spends 85 to 90 percent of his time seeing patients, and about
5 percent of his time conducting clinical research. Tr. at 507. Dr. Liacouras regularly treats infants
with GERD and intussusception. Id. at 510-11. In addition, while Dr. Liacouras treats patients for
a wide variety of GI, liver, and nutrition issues, he routinely diagnoses approximately 300 patients
with gastroesophageal reflux each year. Id. at 510. He further testified that he has diagnosed
roughly 100 patients with intussusception over the course of his career. Id. at 511.

14
   Petitioners devoted some time at hearing in an attempt to impeach Dr. Halsey as biased in favor of Respondent,
based upon his prior advocacy work for an earlier iteration of a rotavirus vaccine that was no longer administered. See
generally Tr. at 414-32. However, these efforts were largely unpersuasive. They did not diminish the probative value
of the specific points from Dr. Halsey’s testimony referenced herein, nor did they successfully establish grounds for
doubting the veracity of Dr. Halsey’s testimony overall, and therefore I do not discuss the relative merits of such
attacks.
                                                         16
        Consistent with Dr. Halsey’s testimony, Dr. Liacouras maintained, based on his review of
the medical evidence, that the rotavirus vaccine did not cause G.J.C. to develop intussusception.
Tr. at 531; Liacouras Rep. at 4. Dr. Liacouras acknowledged that the rotavirus vaccine can cause
an acute intussusception, but maintained that a medically appropriate timeframe to establish
causation would be no more than 21 days after vaccination. Tr. at 558, 559-60. Indeed, most
children experiencing an adverse reaction to the rotavirus vaccine resulting in an intussusception
surgical procedure presented with symptoms within seven days of the vaccine’s administration.
Liacouras Rep. at 5. G.J.C.’s symptoms, by contrast, did not manifest until fifty-five or fifty-seven
days post-vaccination. Tr. at 558-59.

        As support for the above (and in addition to the Yih and Haber articles referenced by Dr.
Halsey), Dr. Liacouras relied on an additional article in support of his proposed temporal interval
that suggested the risk was much diminished over a longer timeframe. See Shui et al., Risk of
Intussusception Following Administration of a Pentavalent Rotavirus Vaccine in US Infants, 307
JAMA 598, 598 (2012), filed as Resp’t’s Ex. A-19 (ECF No. 63-9) (“Shui”). Shui, a cohort study,
examined the risk of intussusception following the RotaTeq vaccine in U.S. infants from May
2006-February 2010, finding no significant risk of developing intussusception following
vaccination in a 1 to 30-day risk window following any dose. Id. at 598; 602.

        Dr. Liacouras also maintained, based on review of the medical records, that G.J.C. had
developed only a one-time, idiopathic, ileocolic acute intussusception -- not a chronic/transient
series of intussusceptions with symptomatology mistakenly identified by G.J.C.’s treaters as
GERD or feeding problems. Tr. at 560; Liacouras Report at 5. Although Dr. Liacouras
acknowledged that some older items of literature included reference to chronic or ongoing
intussusception as a medical concept, the idea did not reflect current thinking in the medical
community, and had not otherwise been properly vetted since it was first proposed so as to be
scientifically reliable. Tr. at 560, 603-04; Liacouras Rep. at 5. Dr. Liacouras testified that he had
never seen a transient intussusception in his clinical practice (or an ileocolic intussusception that
spontaneously reduced without surgical intervention). Tr. at 604, 576.

        In so maintaining, Dr. Liacouras stressed the importance of the precise location in the
bowel of the intussusception. Tr. at 579. While Dr. Liacouras agreed that transient/chronic small-
bowel to small-bowel intussusception could exist in theory, he maintained that an ileocolic
intussusception generally (which he proposed could not be lumped into the overall category “small
bowel,” given its distinct location) would not be transient (and in fact would only be discovered
after disclosure of symptoms so acute that they led parents to seek emergency treatment). Id. at
524, 528, 530-31. Accordingly, he dismissed literature cited by the Petitioners discussing small-
bowel to small-bowel intussusception as not only dated but irrelevant. Tr. at 565-67. An ileocolic
intussusception would usually be diagnosed within hours to a day, and would present no symptoms
                                                17
prior to that timeframe. Id. at 529-30. That did not happen here in a period close in time to G.J.C.’s
receipt of either dose of the rotavirus vaccine. Id. at 532.

        Dr. Liacouras agreed with G.J.C.’s GERD diagnosis, but questioned Dr. Santoro’s opinion
that these symptoms were misdiagnosed, instead constituting evidence of an ongoing transient
intussusception. Tr. at 575; Liacouras Rep. at 3, 5. Based upon his review of the medical records,
Dr. Liacouras opined that G.J.C. developed reflux and a herpangia infection after his first rotavirus
vaccination, was treated with Prilosec for reflux, and then developed an unrelated intussusception
that resolved after surgery. Tr. at 593. Dr. Liacouras allowed for the fact that G.J.C.’s GERD and
intussusception resolved around the same time, but maintained that G.J.C. simply developed two
conditions that were ultimately unrelated. Id. at 593-54. He also took issue with Dr. Santoro’s
suggestion that the failure of efforts to treat G.J.C.’s GERD evidenced that the symptoms were
reflective of something more serious, opining instead (and based upon his specialized experience
as a pediatric gastroenterologist) that G.J.C.’s treaters had not (at least in the January-April
timeframe) given him a high enough dosage of Prilosec to be effective. Id. at 547-48, 589-90.

 IV.     Procedural History

        Shannon and Kyle Carda filed their Petition on March 6, 2014. Pet. at 1. After gathering
affidavits and various relevant medical records, Petitioners filed such materials and then their
statement of completion on April 18, 2014. ECF No. 8. Respondent thereafter filed his Rule 4(c)
Report on June 4, 2014, indicating his view that Petitioners were not entitled to compensation
because G.J.C.’s vaccinations could not be linked to onset of his actual intussusception 56 days
later. ECF No. 9.

        Petitioners filed an expert report from Dr. Santoro on December 16, 2014, after obtaining
extensions of time in which to act. ECF No. 15. Respondent then filed his own expert report in
response on April 9, 2015, from Dr. Halsey. ECF No. 18. On June 25, 2015, Petitioners also filed
a supplemental expert report from Dr. Santoro (ECF No. 23), and Respondent filed a supplemental
expert report from Dr. Halsey on August 31, 2015. ECF No. 26. I subsequently allowed Petitioners
the opportunity to obtain and file an additional expert report focusing on the immunological issues
in this matter, which they attempted to do with Dr. Shoenfeld’s report filed on November 3, 2015.
ECF No. 28. Respondent filed a responsive expert report from Dr. Liacouras on January 8, 2016.
ECF No. 31.

     After the filing of these expert reports, I set the matter for hearing on January 24-25, 2017.
ECF No. 34. The parties also agreed to the dismissal of Petitioners’ Table claim, which I effected

                                                 18
on May 24, 2016. ECF No. 37. Respondent thereafter also filed an additional expert report from
Dr. Halsey on August 8, 2016. ECF No. 43.

       The parties filed pre-hearing submissions from November to December of 2016 (ECF No.
49-52), and the hearing went forward as scheduled. The parties elected to file post-hearing briefs,
doing so by June 6, 2017. ECF Nos. 84, 88-89. This matter is now ripe for adjudication.

 V.       Applicable Legal Standards

         A.       Petitioner’s Overall Burden in Vaccine Program Cases

         To receive compensation in the Vaccine Program, a petitioner must prove either: (1) that
she suffered a “Table Injury” – i.e., an injury falling within the Vaccine Injury Table –
corresponding to one of the vaccinations in question within a statutorily prescribed period of time
or, in the alternative, (2) that her illnesses were actually caused by a vaccine (a “Non-Table
Injury”). See Sections 13(a)(1)(A), 11(c)(1), and 14(a), as amended by 42 C.F.R. § 100.3; §
11(c)(1)(C)(ii)(I); see also 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, 1320 (Fed. Cir. 2006).15
In this case, the Petitioners dismissed their Table claim.

        For both Table and Non-Table claims, Vaccine Program petitioners bear a “preponderance
of the evidence” burden of proof. Section 13(1)(a). That is, a petitioner must offer evidence that
leads the “trier of fact to believe that the existence of a fact is more probable than its nonexistence
before [he] may find in favor of the party who has the burden to persuade the judge of the fact’s
existence.” Moberly, 592 F.3d at 1322 n.2; see also Snowbank Enter. v. United States, 6 Cl. Ct.
476, 486 (1984) (mere conjecture or speculation is insufficient under a preponderance standard).
Proof of medical certainty is not required. Bunting v. Sec’y of Health & Human Servs., 931 F.2d
867, 873 (Fed. Cir. 1991). In particular, a petitioner must demonstrate that the vaccine was “not
only [the] but-for cause of the injury but also a substantial factor in bringing about the injury.”
Moberly, 592 F.3d at 1321 (quoting Shyface v. Sec’y of Health & Human Servs., 165 F.3d 1344,
1352-53 (Fed. Cir. 1999)); Pafford v. Sec’y of Health & Human Servs., 451 F.3d 1352, 1355 (Fed.
Cir. 2006). A petitioner may not receive a Vaccine Program award based solely on her assertions;

15
  Decisions of special masters (some of which I reference in this ruling) constitute persuasive but not binding
authority. Hanlon v. Sec’y of Health & Human Servs., 40 Fed. Cl. 625, 630 (1998). By contrast, Federal Circuit rulings
concerning legal issues are binding on special masters. Guillory v. Sec’y of Health & Human Servs., 59 Fed. Cl. 121,
124 (2003), aff’d, 104 F. App’x 712 (Fed. Cir. 2004); see also Spooner v. Sec’y of Health & Human Servs., No. 13-
159V, 2014 WL 504728, at *7 n.12 (Fed. Cl. Spec. Mstr. Jan. 16, 2014).
                                                         19
rather, the petition must be supported by either medical records or by the opinion of a competent
physician. Section 13(a)(1).

        In attempting to establish entitlement to a Vaccine Program award of compensation for a
Non-Table claim, a petitioner must satisfy all three of the elements established by the Federal
Circuit in Althen: “(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.” Althen,
418 F.3d at 1278.

        Each of the Althen prongs requires a different showing. Under Althen prong one, petitioners
must provide a “reputable medical theory,” demonstrating that the vaccine received can cause the
type of injury alleged. Pafford, 451 F.3d at 1355-56 (citations omitted). 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 549.

        Petitioners may satisfy the first Althen prong without resort to 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, 440 F.3d at 1325-26). 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)), appeal docketed, No. 2015-5097 (Fed.
Cir. June 19, 2015). But this does not negate or reduce a petitioner’s ultimate burden to establish
her 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).16

16
   There is ample contrary authority for the more straightforward proposition that the first Althen prong, like the overall
test itself, simply applies a preponderance standard when evaluating if a reliable and plausible causal theory has been
established. Broekelschen v. Sec’y of Health & Human Servs., 618 F.3d 1339, 1350 (Fed. Cir. 2010). For purposes of
the present analysis, I am stressing those cases focusing on the plausibility of the causal theory proposed, as opposed
to whether preponderant evidence supports it, in order to avoid imposing on Petitioners a greater evidentiary burden
than the law requires. This does not, however, change the fact that any theory’s plausibility, for purposes of satisfying
the Althen test, is properly analyzed by subjecting its components to the Daubert tests for scientific reliability. Terran
v. Sec’y of Health & Human Servs., 195 F.3d 1302, 1316 (Fed. Cir. 1999).
                                                           20
        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 1375-77; Capizzano, 440 F.3d at 1326; Grant v. Sec’y of Health & Human Servs., 956
F.2d 1144, 1148 (Fed. Cir. 1992). In establishing that a vaccine “did cause” injury, the opinions
and views of the injured party’s treating physicians are entitled to some weight. Andreu, 569 F.3d
at 1367; Capizzano, 440 F.3d at 1326 (“medical records and medical opinion testimony are favored
in vaccine cases, as treating physicians are likely to be in the best position to determine whether a
‘logical sequence of cause and effect show[s] that the vaccination was the reason for the injury’”)
(quoting Althen, 418 F.3d at 1280). 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).

        However, medical records and/or statements of a treating physician’s views do not per se
bind the special master to adopt the conclusions of such an individual, even if they must be
considered and carefully evaluated. Section 13(b)(1) (providing that “[a]ny such diagnosis,
conclusion, judgment, test result, report, or summary shall not be binding on the special master or
court”); Snyder v. Sec’y of Health & Human Servs., 88 Fed. Cl. 706, 746 n.67 (2009) (“there is
nothing . . . that mandates that the testimony of a treating physician is sacrosanct – that it must be
accepted in its entirety and cannot be rebutted”). As with expert testimony offered to establish a
theory of causation, the opinions or diagnoses of treating physicians are only as trustworthy as the
reasonableness of their suppositions or bases. The views of treating physicians should also be
weighed against other, contrary evidence also present in the record – including conflicting opinions
among such individuals. Hibbard v. Sec’y of Health & Human Servs., 100 Fed. Cl. 742, 749 (2011)
(not arbitrary or capricious for special master to weigh competing treating physicians’ conclusions
against each other), aff'd, 698 F.3d 1355 (Fed. Cir. 2012); Caves v. Sec’y of Dep't of Health &
Human Servs., 100 Fed. Cl. 119, 136 (2011), aff'd, 463 F. App'x 932 (Fed. Cir. 2012); Veryzer v.
Sec’y of Health & Human Servs., No. 06-522V, 2011 WL 1935813, at *17 (Fed. Cl. Spec. Mstr.
Apr. 29, 2011), mot. for review den’d, 100 Fed. Cl. 344, 356 (2011), aff’d without opinion, 475
Fed. App’x 765 (Fed. Cir. 2012).

        The third Althen prong requires establishing a “proximate temporal relationship” between
the vaccination and the injury alleged. Althen, 418 F.3d at 1281. That term has been equated to the
phrase “medically-acceptable temporal relationship.” Id. A petitioner must offer “preponderant
proof that the onset of symptoms occurred within a timeframe which, given the medical
understanding of the disorder’s etiology, it is medically acceptable to infer causation.” Bazan v.
Sec'y of Health & Human Servs., 539 F.3d 1347, 1352 (Fed. Cir. 2008). The explanation for what
is a medically acceptable timeframe must also coincide with the theory of how the relevant vaccine
can cause an injury (Althen prong one’s requirement). Id. at 1352; Shapiro v. Sec’y of Health &
Human Servs., 101 Fed. Cl. 532, 542 (2011), recons. den’d after remand, 105 Fed. Cl. 353 (2012),
                                                 21
aff’d mem., 2013 WL 1896173 (Fed. Cir. 2013); Koehn v. Sec'y of Health & Human Servs., No.
11-355V, 2013 WL 3214877 (Fed. Cl. Spec. Mstr. May 30, 2013), mot. for review den’d (Fed. Cl.
Dec. 3, 2013), aff’d, 773 F.3d 1239 (Fed. Cir. 2014).

       B.      Law Governing Analysis of Fact Evidence

        The process for making determinations in Vaccine Program cases regarding factual issues
begins with consideration of the medical records. Section 11(c)(2). The special master is required
to consider “all [] relevant medical and scientific evidence contained in the record,” including “any
diagnosis, conclusion, medical judgment, or autopsy or coroner’s report which is contained in the
record regarding the nature, causation, and aggravation of the petitioner’s illness, disability, injury,
condition, or death,” as well as “the results of any diagnostic or evaluative test which are contained
in the record and the summaries and conclusions.” Section 13(b)(1)(A). The special master is then
required to weigh the evidence presented, including contemporaneous medical records and
testimony. See Burns v. Sec’y of Health & Human Servs., 3 F.3d 415, 417 (Fed. Cir. 1993) (it is
within the special master’s discretion to determine whether to afford greater weight to
contemporaneous medical records than to other evidence, such as oral testimony surrounding the
events in question that was given at a later date, provided that such a determination is evidenced
by a rational determination).

        Medical records that are created contemporaneously with the events they describe are
presumed to be accurate and “complete” (i.e., presenting all relevant information on a patient’s
health problems). Cucuras, 993 F.2d at 1528; Doe/70 v. Sec’y of Health & Human Servs., 95 Fed.
Cl. 598, 608 (2010) (“[g]iven the inconsistencies between petitioner’s testimony and his
contemporaneous medical records, the special master’s decision to rely on petitioner’s medical
records was rational and consistent with applicable law”), aff’d, Rickett v. Sec’y of Health &
Human Servs., 468 F. App’x 952 (Fed. Cir. 2011) (non-precedential opinion). This presumption is
based on the linked propositions that (i) sick people visit medical professionals; (ii) sick people
honestly report their health problems to those professionals; and (iii) medical professionals record
what they are told or observe when examining their patients in as accurate a manner as possible,
so that they are aware of enough relevant facts to make appropriate treatment decisions. Sanchez
v. Sec’y of Health & Human Servs., No. 11-685V, 2013 WL 1880825, at *2 (Fed. Cl. Spec. Mstr.
Apr. 10, 2013); Cucuras v. Sec'y of Health & Human Servs., 26 Cl. Ct. 537, 543 (1992), aff'd, 993
F.2d 1525 (Fed. Cir. 1993) (“[i]t strains reason to conclude that petitioners would fail to accurately
report the onset of their daughter’s symptoms. It is equally unlikely that pediatric neurologists,
who are trained in taking medical histories concerning the onset of neurologically significant
symptoms, would consistently but erroneously report the onset of seizures a week after they in fact
occurred”).

                                                  22
        Accordingly, if the medical records are clear, consistent, and complete, then they should
be afforded substantial weight. Lowrie v. Sec’y of Health & Human Servs., No. 03-1585V, 2005
WL 6117475, at *20 (Fed. Cl. Spec. Mstr. Dec. 12, 2005). Indeed, contemporaneously medical
records are generally found to be deserving of greater evidentiary weight than oral testimony –
especially where such testimony conflicts with the record evidence. Cucuras, 993 F.2d at 1528;
see also Murphy v. Sec’y of Health & Human Servs., 23 Cl. Ct. 726, 733 (1991), aff'd, 968 F.2d
1226 (Fed. Cir.), cert. den’d, Murphy v. Sullivan, 506 U.S. 974 (1992) (citing United States v.
United States Gypsum Co., 333 U.S. 364, 396 (1947) (“[i]t has generally been held that oral
testimony which is in conflict with contemporaneous documents is entitled to little evidentiary
weight.”)).

        However, there are situations in which compelling oral testimony may be more persuasive
than written records, such as where records are deemed to be incomplete or inaccurate. Campbell
v. Sec’y of Health & Human Servs., 69 Fed. Cl. 775, 779 (2006) (“like any norm based upon
common sense and experience, this rule should not be treated as an absolute and must yield where
the factual predicates for its application are weak or lacking”); Lowrie, 2005 WL 6117475, at *19
(“[w]ritten records which are, themselves, inconsistent, should be accorded less deference than
those which are internally consistent”) (quoting Murphy v. Sec’y of Health & Human Servs., 23
Cl. Ct. 726, 733 (1991), aff'd per curiam, 968 F.2d 1226 (Fed. Cir. 1992)). Ultimately, a
determination regarding a witness’s credibility is needed when determining the weight that such
testimony should be afforded. Andreu, 569 F.3d at 1379; Bradley v. Sec’y of Health & Human
Servs., 991 F.2d 1570, 1575 (Fed. Cir. 1993).

       C.      Analysis of Expert Testimony

        Establishing a sound and reliable medical theory often requires a petitioner to present
expert testimony in support of his claim. Lampe v. Sec’y of Health & Human Servs., 219 F.3d
1357, 1361 (Fed. Cir. 2000). Vaccine Program expert testimony is usually evaluated according to
the factors for analyzing scientific reliability set forth in Daubert v. Merrell Dow Pharm., Inc., 509
U.S. 579, 594-96 (1993). See Cedillo v. Sec’y of Health & Human Servs., 617 F.3d 1328, 1339
(Fed. Cir. 2010) (citing Terran v. Sec’y of Health & Human Servs., 195 F.3d 1302, 1316 (Fed. Cir.
1999)). “The Daubert factors for analyzing the reliability of testimony are: (1) whether a theory or
technique can be (and has been) tested; (2) whether the theory or technique has been subjected to
peer review and publication; (3) whether there is a known or potential rate of error and whether
there are standards for controlling the error; and (4) whether the theory or technique enjoys general
acceptance within a relevant scientific community.” Terran, 195 F.3d at 1316 n.2 (citing Daubert,
509 U.S. at 592-95).

                                                 23
         The Daubert factors play a slightly different role in Vaccine Program cases than they do
when applied in other federal judicial fora (such as the district courts). Daubert factors are usually
employed by judges (in the performance of their evidentiary gatekeeper roles) to exclude evidence
that is unreliable and/or could confuse a jury. In Vaccine Program cases, by contrast, these factors
are used in the weighing of the reliability of scientific evidence proffered. Davis v. Sec’y of Health
& Human Servs., 94 Fed. Cl. 53, 66-67 (2010) (“uniquely in this Circuit, the Daubert factors have
been employed also as an acceptable evidentiary-gauging tool with respect to persuasiveness of
expert testimony already admitted”). The flexible use of the Daubert factors to evaluate the
persuasiveness and reliability of expert testimony has routinely been upheld. See, e.g., Snyder, 88
Fed. Cl. at 742-45. In this matter (as in numerous other Vaccine Program cases), Daubert has not
been employed at the threshold, to determine what evidence should be admitted, but instead to
determine whether expert testimony offered is reliable and/or persuasive.

        Respondent frequently offers one or more experts of her own in order to rebut a petitioner’s
case. Where both sides offer expert testimony, a special master’s decision may be “based on the
credibility of the experts and the relative persuasiveness of their competing theories.”
Broekelschen v. Sec’y of Health & Human Servs., 618 F.3d 1339, 1347 (Fed. Cir. 2010) (citing
Lampe, 219 F.3d at 1362). However, nothing requires the acceptance of an expert’s conclusion
“connected to existing data only by the ipse dixit of the expert,” especially if “there is simply too
great an analytical gap between the data and the opinion proffered.” Snyder, 88 Fed. Cl. at 743
(quoting Gen. Elec. Co. v. Joiner, 522 U.S. 146 (1997)); see also Isaac v. Sec’y of Health & Human
Servs., No. 08-601V, 2012 WL 3609993, at *17 (Fed. Cl. Spec. Mstr. July 30, 2012), mot. for
review den’d, 108 Fed. Cl. 743 (2013), aff’d, 540 Fed. App’x 999 (Fed. Cir. 2013) (citing Cedillo,
617 F.3d at 1339).

        Weighing the relative persuasiveness of competing expert testimony, based on a particular
expert’s credibility, is part of the overall reliability analysis to which special masters must subject
expert testimony in Vaccine Program cases. Moberly, 592 F.3d at 1325-26 (“[a]ssessments as to
the reliability of expert testimony often turn on credibility determinations”); see also Porter v.
Sec’y of Health & Human Servs., 663 F.3d 1242, 1250 (Fed. Cir. 2011) (“this court has
unambiguously explained that special masters are expected to consider the credibility of expert
witnesses in evaluating petitions for compensation under the Vaccine Act”). It is in the exercise of
my duties as a special master to weigh competing expert testimony. Copenhaver v. Sec’y of Health
& Human Servs., No. 13-1002V, 2016 WL 6947389, at *5 (Fed. Cl. Oct. 20, 2016) (“Special
Masters may use their discretion in weighing expert testimony, and case law supports that
discretion”).

       In determining whether a particular expert’s testimony was reliable or credible, I may
consider whether the expert offers an opinion that exceeds his training or competence. Walton v.
                                               24
Sec’y of Health & Human Servs., No. 04-503V, 2007 WL 1467307, at *17-18 (Fed. Cl. Spec. Mstr.
Apr. 30, 2007) (otolaryngologist not well suited to testify about disciplines other than her own
specialty). While (in keeping with the liberality with which evidence offered in Vaccine Program
cases is treated) I heard and have considered all of the testimony of the experts offered at the
entitlement hearing, I may properly evaluate, and give appropriate weight to, whether certain
testimony is beyond a particular expert’s purview. See, e.g., King v. Sec’y of Health & Human
Servs., No. 03-584V, 2010 WL 892296, at *78-79 (Fed. Cl. Spec. Mstr. Mar. 12, 2010)
(petitioner’s expert far less qualified to offer opinion on general causation issues pertaining to
autism than specific issues pertaining to the petitioner’s actual medical history, given the nature of
the expert’s qualifications).

       D.      Consideration of Medical Literature

        Both parties filed medical and scientific literature in this case, including some articles (such
as those discussing molecular mimicry and protein sequences in vaccines) that do not factor into
the outcome of this decision. I have reviewed all of the medical literature submitted in this case,
but I only discuss those articles that are most relevant to my determination and/or are central to
Petitioners’ case – just as I have not exhaustively discussed every individual medical record filed.
Moriarty v. Sec’y of Health & Human Servs., No. 2015-5072, 2016 WL 1358616, at *5 (Fed. Cir.
Apr. 6, 2016) (“[w]e 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. v. Sec’y of Health & Human Servs., 527 F. App’x 875, 884 (Fed. Cir.
2013) (“[f]inding certain information not relevant does not lead to — and likely undermines —
the conclusion that it was not considered”).

                                             ANALYSIS

I.     Overview of Intussusception

         Intussusception is formally defined as the invagination, or telescoping, of one segment of
the intestine within another, resulting in a bowel obstruction or ischemia. Jiang et al., Childhood
Intussusception: A Literature Review, 8 PlosOne E68482 (2013), filed as Resp’t’s Ex. A.10 (ECF
No. 62-10) (“Jiang”); CDC, Addition of History of Intussusception as a Contraindication for
Rotavirus Vaccination 1 (2011), filed as Ex. 12-3 (ECF No. 70-3). It is the most common cause of
bowel obstruction in infants, typically occurring in children between four and ten years old. Jiang
at 1. In children, the first sign of intussusception is usually loud crying caused by acute abdominal

                                                  25
pain.17 Infants may also pull their knees to their chest during crying episodes, indicating abdominal
pain associated with intussusception. Id. Symptoms can include stool mixed with blood and mucus,
vomiting, lethargy, diarrhea, fever, and lumps in the abdomen. Id.

       The cause of intussusception is unknown.18 However, some factors that produce an
intussusception shed light on what might precipitate it. Relevant literature suggests that an
intussusception can result from a viral syndrome or infection. Mary L. Brandt, Intussusception,
Oski’s Pediatrics (4th ed. 2006), filed as Resp’t’s Ex. A-2 (ECF No. 62-2). Idiopathic
intussusceptions, specifically, result from enlarged lymphoid tissue, further supporting a viral
cause. Id. Generally, viral symptoms associated with intussusception include hyperplasia of
lymphoid tissue or swelling of the intestinal wall. Minney-Smith et al., Intussusception Is
Associated with the Detection of Adenovirus C, Enterovirus B and Rotavirus in a Rotavirus
Vaccinated Population, 61 J. Clin. Virology 579, 579-80 (2014), filed as Resp’t’s Ex. A-11 (ECF
No. 63-1). It has been suggested that an intestinal invagination, or intussusception, can be triggered
by post-infection hyperplasia in the gastrointestinal tract, following the rotavirus for example, and
generally occurs within twenty-one days after the initial rotavirus vaccination. Id.; see Yih at 506.

       An intussusception is a life-threatening illness.19 Untreated, intussusception can cause
abdominal infection and internal bleeding. Id. Typically, an intussusception diagnosis can be made
using an abdominal x-ray, upper gastrointestinal series, or a barium enema. Id. Treatment varies,
and can include an air enema or surgical intervention. Id.

II.        Petitioners Have Not Carried Their Burden of Proof

           A.          Petitioners’ Causation Theory is Unreliable

       Importantly for purposes of analysis, Petitioners’ causation theory did not propose that
RotaTeq could (whether alone or after a series of doses) cause an acute intussusception a month
or more later, with no intervening symptoms. Rather, they attempted to establish that the rotavirus
vaccine could cause a series of transient, almost subclinical and self-resolving intussusceptions,
abetted by a second dose, then culminating in an acute intussusception several weeks after

17
  Symptoms and Causes, Mayo Clinic, http://www.mayoclinic.org/diseases-conditions/intussusception/symptoms-
causes/dxc-20166963 (last visited Oct. 5, 2017).

18
  Intussusception, Stanford Children’s Hospital, http://www.stanfordchildrens.org/en/topic/default?id
=intussusception-90-P02002 (last visited Oct. 5, 2017).

19
     See n.18 above.

                                                        26
vaccination. But the evidence offered for this theory was unreliable, and Petitioners’ experts were
simply not persuasive in establishing it based solely on their individualized expertise.

         First, Petitioners have not demonstrated with updated and reliable scientific or medical
evidence that there is a recognized condition of “chronic” or transient intussusception that could
later result in the commonly-understood, acute form. Petitioners’ experts could not draw on
identifiable, specific expertise on the topic of intussusception (either from research or clinical
experience), and therefore their reports referenced literature to support this concept.20 But the
articles cited by Petitioners (which are either somewhat dated or are case studies of inherently less
probative value) merely suggest that a child might inadvertently be found to have experienced a
single intussusception that spontaneously resolved without the need for surgical intervention – and
without subsequent recurrence. Mateen, for example, involved patients presenting with symptoms
of intestinal obstruction, five of whom had been symptomatic for less than a day, and were
diagnosed with an intussusception that resolved on its own – not with a chronic, ongoing condition
that later manifested as an acute condition. Mateen at 413. Steffen was a single-patient case report
involving an intussusception diagnosis following four weeks of intermittent abdominal pain.
Steffen at 4981. No literature was offered demonstrating an instance in which transient
intussusception was identified, and then later culminated in an acute event.

         Respondent’s experts, by contrast, persuasively established (based upon both their
particular expertise as well as the literature marshalled in this case) that at best, a “transient”
intussusception was one that was incidentally discovered as having spontaneously resolved – not
an ongoing condition with symptoms that might be confused with GERD or other common infant
feeding issues. Respondent also effectively demonstrated that the ileocolic region of the intestine
is distinguishable, for present purposes, from the small bowel, and thus was even less likely the
location of the kind of chronic or ongoing intussusception urged by Petitioners. Petitioners’ own
literature discussing the concept of recurring intussusception acknowledges this distinction – as
well as the greater concept that the “transience” of any such intussusception is also a measure of
its insignificance. See, e.g., Strouse et al., Transient Small-Bowel Intussusception in Children on
CT, 33 Pediatr. Radiol. 316, 316, filed as Ex. 12-20 (ECF No. 70-20) (excluding ileocolic
intussusceptions from review study of small-bowel intussusceptions), 320 (“the majority of small
bowel intussusceptions identified on CT are transient and of little or no clinical significance”);
Kim, U.S. Features of Transient Small Bowel Intussusception in Pediatric Patients, 5 Korean J.
Radiol. 178, 178-84 (2004), filed as Ex. 12-21 (ECF No. 70-21), at 178 (distinguishing between
ilecolic and small bowel intussusception).

20
  I am aware that claimants are not compelled to offer literature to support a causation theory, and therefore I cannot
require such proof. But as noted, Petitioners did offer literature, and it is evident after hearing their experts that the
experts lacked sufficient individual expertise to fill in an evidentiary hole that would have been left had such literature
not been offered. Accordingly, it is reasonable for me to evaluate the probative value of the offered literature.
                                                           27
        This raises the second deficiency in Petitioners’ theory. Even if the Petitioners had
established, with reference to persuasive and reliable evidence, the existence of a chronic/transient
form of intussusception that could later produce an acute intussusception, they have not reliably
established that the rotavirus vaccine could, when administered in series as herein, cause a
transient or chronic subclinical intussusception in the first place.21 Nothing was offered to establish
that RotaTeq (or any other vaccine for that matter) could cause a child to experience recurring or
transient intussusceptions. The manner in which the rotavirus causes an acute intussusception, as
discussed above, also bears on its capacity, in vaccine form, to cause the kind of ongoing
intussusception envisioned by Petitioners. As Respondent’s experts persuasively established, the
impact of the viral infection is understood to be sudden and severe – not persistent over time to a
sufficient degree to maintain an undercurrent intussusception.

        Petitioners’ experts were unable to fill this evidentiary gap with reliable testimony drawn
from their own experience in research or treatment. Dr. Shoenfeld, Petitioners’ immunologist,22
relied on concepts (challenge-rechallenge, for example) that have not been demonstrated to be
relevant to the kind of live vaccine at issue, and he otherwise seemed to invoke mechanistic models
(for example, the idea that vaccines can spark, via inflammation, a persistent, ongoing immune
response) that facially are inapposite (given his admission that intussusception has not been shown
by science to be autoimmune in nature). Tr. at 245. He also demonstrated no specific knowledge
pertinent to the nature of G.J.C.’s illness or the RotaTeq vaccine to imbue his opinions with any
added heft.

       The assumption of Petitioners’ theory seems to have been that if the rotavirus vaccine is
known to cause acute intussusception, it reasonably could also potentially cause a chronic
intussusception. But the evidence offered failed to establish this by a preponderance.

        B.       Petitioners Have Not Demonstrated that G.J.C. Suffered from a Transient or
                 Chronic Intussusception Prior to his May 2013 Surgical Procedure

       Parallel to their inability to establish that a child could suffer from a series of chronic,
subacute intussusceptions, the Cardas were unsuccessful in demonstrating that G.J.C.’s symptoms

21
   By Dr. Shoenfeld’s admission, intussusception is not understood to be autoimmune, so arguments often advanced
in the Program about insidious autoimmune processes, producing chronic inflammation over time in a progressive or
smoldering fashion, cannot be invoked herein as analogous to the course of symptoms G.J.C. experienced.

22
   I discount opinions offered in this case by Dr. Santoro on the RotaTeq vaccine’s alleged causal connection to a
transient intussusception, not only because of Dr. Shoenfeld’s comparatively superior expertise on immunologic
matters, but also because Dr. Santoro’s own background as a gastroenterologist did not extend to such topics.

                                                       28
prior to his May 2013 intussusception procedure actually reflected a series of less severe
intussusceptions. Rather, the existing medical record best supports the conclusion that from
January 2013 until the intussusception requiring medical intervention, G.J.C. suffered from
intermittent GERD and related gastrointestinal symptoms that (however alarming the Cardas
reasonably found them to be) were not reflective of a chronic intussusception or something more
insidious. The record does not allow me to propose an etiology for those symptoms23, but it better
supports Dr. Liacouras’s opinion that G.J.C.’s GERD was distinct from his later intussusception –
not that the former was a precursor of the latter or some lesser version of it.

         Several evidentiary factors support this determination. No treaters ever proposed that
G.J.C. was experiencing the kind of chronic intussusception Petitioners maintain he experienced.
G.J.C.’s overall course is instead more reasonably characterized (a reflected in the record
evidence) as intermittent feeding and GERD problems, with nothing so serious as to require
medical intervention until the second half of May, and nothing resembling the kind of acute
reaction consistent with intussusception as it is most commonly understood to manifest, let alone
the far less well-supported chronic intussusception diagnosis urged by Petitioners. It is speculative
to suggest, as Petitioners do, that symptoms that are congruent with some intussusception
symptoms, but that do not result in the acute distress associated with an intussusception requiring
surgical intervention should be read to reflect a chronic form of intussusception. To hijack Dr.
Santoro’s “horse vs. zebra” analogy, the existing medical record may have been filled with the
sound of hoof beats, but it lacks anything suggestive of a stripe.

        In addition, although the medical records establish that the Cardas were dutiful in their care
of G.J.C., they do not corroborate their after-the-fact assertions that his feeding problems were as
severe or alarming as they testified to during the hearing. It is well established in the Vaccine
Program that contemporaneous medical records created at the time of the events they describe are
presumed accurate and complete. See Cucuras, 993 F.3d at 1528 (“[O]ral testimony in conflict
with contemporaneous documentary evidence deserves little weight”); Murphy, 23 Cl. Ct. at 733
(citing United States v. Gypsum Co., 333 U.S. 364, 396 (1947)); Lowrie, 2005 WL 6117475, at
*19. It is true that G.J.C.’s feeding issues did not resolve in this period and/or recurred, but Dr.
Liacouras persuasively established that G.J.C.’s medical providers may simply not have gotten the
treatments (for example, the Prilosec dosage) exactly right. Tr. at 547-48, 589-90. Dr. Liacouras
also convincingly established that even if there is such a thing as a serial, transient small bowel

23
   As noted above, there is evidence that G.J.C.’s herpangina could have been the actual precursor cause for his
intussusception (Tr. at 593), although there is not sufficient support in the medical record (for example, a treater’s
embracing of this explanation) for me to conclude it to be “more likely than not.” In any event, Petitioners are arguing
not that either vaccine was the direct cause of the surgical intussusception, but instead that the RotaTeq doses G.J.C.
received caused a more mild, transient intussusception that later manifested in the May 2013 surgery. And it cannot
be disputed that G.J.C. received his first dose of the vaccine long before the herpangina diagnosis.
                                                          29
intussusception, the specific location in which G.J.C.’s acute intussusception occurred (ileocolic
region) rendered his condition distinguishable.

        In finding as I do, I am giving greater weight to the testimony of Respondent’s
gastroenterologic expert, Dr. Liacouras, than that provided by Dr. Santoro. But I am empowered
to do so, concurrent with the need to make credibility determinations in assessing the probative
value of witness testimony in a Vaccine Program case. See Porter, 663 F.3d at 1250 (“[T]his court
has unambiguously explained that special masters are expected to consider the credibility of expert
witnesses in evaluating petitions for compensation under the Vaccine Act.”); Copenhaver, 2016
WL 6947389, at *5 (“Special Masters may use their discretion in weighing expert testimony, and
case law supports that discretion.”). Dr. Liacouras demonstrated a high degree of facility and
expertise with pediatric gastroenterologic matters, rendering his testimony on these matters far
more compelling than Dr. Santoro (whose expertise on the topic specifically at issue was more
general), and I have reasonably relied on my impressions of his greater credibility and
persuasiveness in so finding.

       C.      The Timeframe Between G.J.C.’s Receipt of RotaTeq Doses and his Intussusception
               Has Not Been Demonstrated to be Medically Acceptable

        The most reliable medical literature offered in this case establishes a short temporal
connection between acute intussusception and vaccine administration. See, e.g., Yih at 506. There
is no medically acceptable timeframe suggesting an intussusception following a rotavirus
vaccination would occur more than 21 days post-vaccination. This is consistent with the timeframe
allowed for by the Table claim (see 42 C.F.R. § 100.3 (2017)), which is grounded in the scientific
observation of how the RotaTeq vaccine would cause the condition. Id. As Dr. Halsey explained,
the response to receipt of the live strains of rotavirus contained in RotaTeq would inherently be
fairly sudden, and would not be subject to the kind of rechallenge response that characterizes
different kinds of vaccines. Tr. at 393, 400-01, 405.

         Because of the foregoing, the date G.J.C.’s intussusception was first observed by his
treaters (two months from his second vaccination) is too attenuated from the vaccine’s
administration to constitute a persuasive temporal relationship. The period between when G.J.C.
first received RotaTeq (January) and his May intussusception is even less defensible as medically
reasonable, at least based on existing reliable science. Such timing conclusions are consistent with
the most reliable evidence offered in this case. See, e.g., Murphy at 564; Haber at 4873.

       Nothing argued by Petitioners’ experts was sufficiently reliable or persuasive to overcome
the above. They offered little in the way of reliable scientific or medical evidence suggesting what
timing would even be expected between vaccination and the beginning of a series of chronic
                                                  30
intussusceptions. And as already noted, their timing theory relied heavily on the determination that
there is such a thing as vaccine-induced transient or chronic intussusception that can precede an
acute intussusception – so my findings above largely preempt the need to consider if the timing
shown herein is medically acceptable. But the arguments Petitioners’ experts otherwise made were
substantively weak. Dr. Shoenfeld, for example, maintained that periods even more lengthy than
relevant herein were still plausible, despite his reliance on mechanisms (for example, ongoing
autoimmune reactions) that do not bear on the injury in question. Tr. at 295-97.

        The deficiencies in such arguments are highlighted when measured against the total
timeframe for the period relevant to this case. Approximately nine weeks passed between the first
and second doses of RotaTeq, with no reported reaction other than the aforementioned GERD and
feeding issues, none of which resulted in hospitalization or a level of intervention comparable to
what G.J.C. later experienced. Thereafter, an additional eight weeks passed from the second dose
to G.J.C.’s intussusception requiring surgery on May 22nd. Petitioners have not established with
credible, persuasive evidence that it is reasonable to conclude that such long time periods are
acceptable timeframes in which a transient/chronic intussusception would fester, later resulting in
an acute intussusception.

         In many respects, it appears Petitioners have attempted to shoehorn a timeframe theory into
the chronology relevant to G.J.C.’s history, characterized as it is by long periods of mild symptoms
not deemed significant by treaters, rather than the acute incidents associated with intussusception
as it is best understood. See, e.g., Tr. at 312-13. But such ends-based reasoning relies too heavily
on the temporal relationship between G.J.C.’s vaccinations and his later intussusception, and is
clearly rejected by relevant case law. See, e.g., U.S. Steel Group v. United States, 96 F.3d 1352,
1358 (Fed. Cir. 1996) (“But to claim that the temporal link between these events proves that they
are causally related is simply to repeat the ancient fallacy: post hoc ergo propter hoc”); Fricano v.
United States, 22 Cl. Ct. 76, 80 (1991) (“[P]ost hoc ergo propter hoc . . . is regarded as neither
good logic nor good law”); Doe/34 v. Sec’y of Health & Human Servs., 2009 WL 1955140, at *10
(Fed. Cl. Spec. Mstr. Mar. 4, 2009); Pafford v. Sec’y of Health and Human Servs., No. 01-0165V,
2004 WL 1717359, at *9 (Fed. Cl. Spec. Mstr. July 16, 2004), aff’d, 64 Fed. Cl. 19 (2005), aff’d,
451 F.3d 1352 (Fed. Cir. 2006).

       D.      Petitioners Have Not Carried Their Burden of Proof.

       Because of the above findings, I find that Petitioners have offered insufficient preponderant
evidence in support of the three Althen prongs.

      Regarding the first, “can cause” Althen prong, Petitioners have failed to establish that the
RotaTeq vaccine can cause a chronic/transient series of intussusceptions that over time manifest
                                              31
into a single acute incident akin to the kind of injury included in the Table version of such a claim.
They offered insufficient, up-to-date, reliable scientific or medical evidence supporting the
conclusion that there is some form of transient intussusception, let alone a chronic condition that
is vaccine-induced. Their reliance on VAERS-style data to support the proposed connection is
unpersuasive, as observed in other cases. See, e.g., Vig v. Sec’y of Health & Human Servs., No.
01-198V, 2013 WL 6596683, at *17 (Fed. Cl. Spec. Mstr. Nov. 14, 2013) (“VAERS is a stocked
pond, containing only reports of adverse events after vaccinations but no data about the number of
vaccines administered or the occurrence of the same adverse event in individuals who have not
been vaccinated. Thus, the information in the VAERS report is meaningless without this additional
data”) (internal quotations omitted)). And neither of Petitioners’ experts had sufficient direct
experience with the relevant vaccine or injury at issue to fill evidentiary holes with their own
personal observations or opinions on the subject.

        Next, Petitioners have not offered sufficient preponderant evidence on the second Althen
prong to permit the conclusion that the RotaTeq vaccine likely caused G.J.C.’s May 2013
intussusception, by initiating a series of chronic intussusceptions culminating in a more acute
event. Rather, the evidence (supported by Dr. Liacouras’s persuasive testimony) supports the
determination that G.J.C.’s ongoing GERD and feeding issues were just that – concerning but not
acute, and not evidence of the mild, chronic form of intussusception that Petitioners argue exists.
Certainly no treater ever associated G.J.C.’s symptoms as chronic intussusception. I also see
nothing in the record that suggests G.J.C. experienced a vaccine reaction of any kind. To the extent
the Petitioners hoped to vary the contemporaneous medical records with their own statements
about the severity of G.J.C.’s alleged vaccine reaction, they have not succeeded in doing so.

        Finally, Petitioners were unsuccessful in establishing that the timeframe between G.J.C.’s
vaccinations and his acute intussusception was medically appropriate for causation. Far too much
time passed between the second RotaTeq dose and the May 2013 intussusception to conclude there
is an acceptable causal relationship, and Petitioners could not demonstrate reliable medical or
scientific support (beyond offering limited case studies or more VAERS data) supporting the
reasonableness of such timeframes. The most reliable evidence suggests the rotavirus vaccine
would cause intussusception quickly – not seven or eight weeks later – and the arguments
marshalled by Dr. Shoenfeld against this conclusion relied on circumstances inapposite to this case
and the nature of the relevant injury. Petitioners also failed to establish any identifiable relationship
between the first and second RotaTeq doses such that I could conclude the second’s
immunogenicity was enhanced consistent with the concept of “challenge-rechallenge.” Rather -
the most reliable evidence offered herein on this subject, such as Yih or Haber, establishes a risk
only after the first dose of RotaTeq, and then only in a narrow temporal window. Yih at 503. That
timeframe was exceeded herein.

                                                   32
                                             CONCLUSION

        The Vaccine Act permits me to award compensation only if a petitioner alleging a “non-
Table Injury” can show by medical records or competent medical opinion that the injury was more
likely than not vaccine-caused. The Petitioners were not successful in doing so in this case. I
therefore must DENY this claim for compensation.

        In the absence of a timely-filed motion for review (see Appendix B to the Rules of the
Court), the Clerk shall enter judgment in accord with this decision.24

IT IS SO ORDERED.

                                                           /s/ Brian H. Corcoran
                                                           Brian H. Corcoran
                                                           Special Master

24
   Pursuant to Vaccine Rule 11(a), the parties may expedite entry of judgment by each filing (either jointly or
separately) a notice renouncing their right to seek review.
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