Clinical trial NCT00973284: Norwalk Vaccine Study
Official title: Phase 1-2, Randomized, Multi-Center, Double-Blind, Placebo-Controlled, Safety and Efficacy Study in Healthy Adults of Intranasal Norwalk Virus-like Particle Vaccine in Experimental Human Norwalk Virus Infection
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE1
PHASE2
Conditions: Acute Gastroenteritis
Norwalk Virus Infection
Keywords: Prevention of acute gastroenteritis due to infection with and experimental Norwalk Virus
Lead sponsor: Takeda
Sponsor class: INDUSTRY
First posted: 2009-09-09
Enrollment: 98
Sex: ALL
Minimum age (years): 18
Maximum age (years): 50
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: The purpose of this study was to evaluate the efficacy of the Norwalk virus-like particle (VLP) vaccine as determined by the illness rate of viral acute gastroenteritis (AGE) during the inpatient stay.

Detailed description: The drug being tested in this study is called intranasal Norwalk virus-like particle (VLP) vaccine. Norwalk VLP vaccine is being tested to prevent viral acute gastroenteritis (AGE). This study will look at the illness rate of AGE in people who are administered the Norwalk VLP vaccine.

The study enrolled 98 patients and was conducted in 2 stages: the Vaccination Stage and the Challenge Stage. In the Vaccination Stage participants were randomly assigned (by chance, like flipping a coin) to one of the two treatment groups-which remained undisclosed to the patient and study doctor during the study (unless there is an urgent medical need):

* Norwalk VLP Vaccine (100 µg VLP) intranasally
* Placebo (dummy inactive powder) - this is a powder that looks like the study drug but has no active ingredient During the Challenge Stage participants were administered live Norwalk virus and were monitored for AGE.

This multi-center trial was conducted in the United States. The overall time to participate in this study was up to 29 weeks Participants made multiple visits to the clinic and were contacted by telephone 6 months after last dose of study drug for a follow-up assessment.

Eligibility criteria: Inclusion Criteria:

1. Signed informed consents.
2. Age 18 - 50 years, inclusive.
3. Good general health as determined by a screening evaluation within 45 days of randomization.
4. Expressed interest, availability, and understanding to fulfill the study requirements including measures to prevent Norwalk virus contamination of the environment and spread of infection and illness to the community. The prospective subjects must pass (\> 75 % correct answers) a written examination on all aspects of the study before enrollment. (Appendix D)
5. Available to return for follow-up visits following discharge from the inpatient unit and deliver stool specimens to the investigator promptly.
6. Female subjects must be of non-childbearing potential, or if of childbearing potential (as determined by the investigator) must be practicing abstinence or using an effective licensed method of birth control (e.g. oral contraceptives; diaphragm or condom in combination with contraceptive jelly, cream, or foam; intrauterine contraceptive device, or Depo-Provera; skin patch; vaginal ring or cervical cap) for 30 days prior to vaccination and must agree to continue such precautions during the study and for 60 days after the Challenge visit. Male subjects must agree not to father a child during the study and for 60 days after the Challenge visit.
7. Demonstrated to be H type-1 antigen secretor positive (by saliva test). \[This saliva test may be done outside of the 45 day window and does not need to be repeated.\]
8. Agrees not to participate in another clinical trial with an investigational product for the entire duration of the study (six months after the last dose of study vaccine or placebo i.e. 201 days).

Exclusion Criteria:

1. Living with or having daily contact with children age 5 years or less or a woman known to be pregnant. This includes significant contact at home, school, day-care, or equivalent facilities.
2. Nursing mother.
3. Living with or having daily contact with childcare workers.
4. Living with or having daily contact with elderly persons aged 70 years or more, or infirmed, diapered individuals, persons with disabilities or incontinent persons. This includes work or visits to nursing homes and day-care or equivalent facilities.
5. Evidence of recent (within 2 months) or of current nonbacterial gastroenteritis suggestive of Norwalk virus infection \[vomiting or unformed or watery stools ( \> 2 during a 24 hour period)\].
6. Any gastroenteritis within the past 2 weeks.
7. History of chronic functional dyspepsia, chronic gastroesophageal reflux disease, peptic ulcer disease, gastrointestinal hemorrhage, gall bladder disease, inflammatory bowel disease, irritable bowel syndrome, frequent diarrhea, chronic constipation, or diverticulitis anytime during the subject's lifetime.
8. Regular use of medication other than oral contraceptive agents, anti-hypertensives, anti-depressants, vitamins and minerals.
9. History of any of the following medical illnesses:

   * Chronic rhinitis, runny nose, sneezing (including seasonal allergies)
   * Clinically significant nose bleed within the prior 12 months
   * Diabetes
   * Cancer (malignancies other than a resolved skin lesion)
   * Heart disease (hospitalization for a heart attack, arrhythmia, or syncope)
   * Unconsciousness (other than a single brief "concussion")
   * Seizures (other than febrile seizures as a child \<5 years old)
   * Asthma requiring treatment with inhaler or medication in the prior 2 years
   * Neuro-inflammatory disease
   * Autoimmune disease
   * Eating disorder
   * Chronic headaches associated with vomiting
   * Chronic vomiting syndrome
10. Any current illness requiring daily medication other than vitamins, minerals, birth control, anti-depressants or anti-hypertensives.
11. Blood Type B or AB. \[This blood test may be done outside of the 45 day window and does not need to be repeated.\]
12. Allergies or hypersensitivity to chitosan, shrimp, other shellfish or any component of the vaccine or placebo.
13. History of nasal surgery of any type (including tonsillectomy or adenoidectomy).
14. Any clinically significant abnormality detected on physical examination, including:

    * Murmur (other than a functional murmur)
    * Focal neurological abnormality
    * Hepatosplenomegaly
    * Lymphadenopathy
    * Jaundice
15. Hypertension defined as BP \> 150/90 mm Hg on two separate measurements. Chronic stable well-controlled hypertension on medications is allowed.
16. History of more than 3 hospitalizations for invasive bacterial infections (pneumonia, meningitis), acute or chronic dermatitis (e.g. eczema, seborrhea, psoriasis) or collagen vascular disease \[e.g. systemic lupus erythematosus (SLE) or dermatomyositis\].
17. Presence of other serious chronic illness (i.e. malignancy other than a resolved skin lesion).
18. Positive stool/fecal culture for bacterial pathogens (salmonella, campylobacter, E. coli 0157:H7, and shigella) or positive stool/fecal screen for ova and parasites.
19. Employment in the food service industry, such as restaurants, or cafeteria facilities. Specifically, this will include persons whose employment requires food processing in the 4 weeks following challenge.
20. Health-care workers with patient contact expected in the 4 weeks following challenge.
21. Expected contact (through employment or at home) with immunocompromised persons (HIV-positive, receiving immunosuppressive medications such as oral steroids, anti-neoplastic agents) in the 4 weeks following challenge.
22. Employment as an airline flight attendant, scheduled to work in the 4 weeks following challenge.
23. Persons planning on taking a cruise in the 4 weeks following challenge.
24. Persons who have consumed or plan to consume raw shellfish (e.g. oysters) within 7 days prior to enrollment or throughout the study.
25. Any of the following lab abnormalities:

    * Absolute neutrophil count (ANC) or total white blood cell (WBC) outside the normal range (may be repeated once if outside this limit)
    * Hemoglobin outside the normal range (may be repeated once if outside this limit)
    * Platelet count outside the normal range (may be repeated once if outside this limit)
    * Electrolytes, blood urea nitrogen (BUN) and/or creatinine outside the normal range (may be repeated once if outside this limit)
    * Glucose \> upper limit of normal (ULN) (may be repeated once if outside this limit). Fasting glucose is not required.
    * Alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase, bilirubin (total and indirect) or gamma glutamyl transferase (GGT) outside the normal range (may be repeated once if outside this limit)
    * Positive serology for hepatitis C or human immunodeficiency virus (HIV) antibody or hepatitis B surface antigen or rapid plasma reagin (RPR)
26. For women, positive serum pregnancy test within 14 days or positive urine pregnancy test within 24 hours of randomization.
27. Temperature \> 99.7°F orally or symptoms of an acute self-limited illness such as an upper respiratory infection or gastroenteritis within 3 days of randomization.
28. Previous participation in a study of experimental norovirus infection or vaccines.
29. Study site personnel or their family members.
30. Significant history of psychiatric hospitalization, alcohol abuse, or illicit drug use.
31. Receipt of a licensed live vaccine within 28 days or a licensed inactivated vaccine within 14 days of randomization.
32. Completion of an investigational vaccine or drug study within 28 days of randomization.
33. Other condition that in the clinical judgment of the investigator would jeopardize the safety or rights of a subject participating in the trial, would render the subject unable to comply with the protocol or would interfere with the evaluation of the vaccination stage or the evaluation of the challenge stage.

Primary outcomes:
measure: Percentage of Participants with Viral Acute Gastroenteritis (AGE)
timeFrame: 7 Days Post-Challenge
Secondary outcomes:
measure: Percentage of Participants with Norwalk Virus Infection Anytime Post Challenge
timeFrame: Up to 30 Days Post-Challenge
measure: Severity of Viral AGE using the Modified Vesikari Scale
timeFrame: Up to 30 Days Post-Challenge
measure: Duration of Viral AGE Among Challenged Participants
timeFrame: Up to 30 Days Post-Challenge
measure: Percentage of Participants with Norwalk Virus Antigen Detected in the Stool
timeFrame: Days 1 thru 4, 7, 21 and 30 in the Challenge Stage
measure: Percentage of Participants with Seroconversion in Serum Anti-Norwalk Virus
timeFrame: Pre-Challenge to 30 Days Post-Challenge
measure: Percentage of Participants with Norwalk RT-PCR Positive Titer in Stool Anytime Post Challenge
timeFrame: Days 1 thru 4, 7, 21 and 30 in the Challenge Stage
measure: Percentage of Participants with Any Local Intranasal Symptoms during the Vaccination Stage
timeFrame: 7 Days Post Dose 1 and 2
measure: Percentage of Participants with Any Systemic Solicited Symptoms Anytime Post-Challenge
timeFrame: Up to 21 Days Post-Challenge
measure: Percentage of Participants with Serious Adverse Events (SAEs)
timeFrame: 180 days following the last study vaccination (Up to Day 201)
measure: Norwalk PAN-Ig Serum-ELISA Geometric Mean Titer (GMT)
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and Dose 2
measure: Norwalk PAN-Ig Serum-ELISA Geometric Mean Fold Rise (GMFR)
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and Dose 2
measure: Percentage of Participants with Norwalk PAN-Ig Serum-ELISA Seroresponse (4-Fold Rise)
timeFrame: Pre-dose 1 and 21 Days Post Dose 1 and 2
measure: Norwalk IgG Serum-ELISA GMT
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and Dose 2
measure: Norwalk IgG Serum-ELISA GMFR
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and Dose 2
measure: Percentage of Participants with Norwalk IgG Serum-ELISA Seroresponse (4-Fold Rise)
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and 2
measure: Norwalk IgA Serum-ELISA GMT
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and Dose 2
measure: Norwalk IgA Serum-ELISA GMFR
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and Dose 2
measure: Percentage of Participants with Norwalk IgA Serum-ELISA Seroresponse
timeFrame: Pre-Dose 1 and 21 Days Post Dose 1 and 2
Other outcomes:
Locations:
city: Baltimore
country: United States
facility: SNBL
state: Maryland
city: Cincinnati
country: United States
facility: Cincinnati Childrens Hospital Medical Center
state: Ohio
city: Houston
country: United States
facility: Baylor College of Medicine
state: Texas
Study officials:
affiliation: Baylor College of Medicine
name: Robert L Atmar, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Children's Hospital Medical Center, Cincinnati
name: David I Bernstein, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Johns Hopkins University
name: Clayton D Harro, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: SNBL Clinical Pharmacology Center, Inc.
name: Mohamed S Al-Ibrahim, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Atmar RL, Bernstein DI, Harro CD, Al-Ibrahim MS, Chen WH, Ferreira J, Estes MK, Graham DY, Opekun AR, Richardson C, Mendelman PM. Norovirus vaccine against experimental human Norwalk Virus illness. N Engl J Med. 2011 Dec 8;365(23):2178-87. doi: 10.1056/NEJMoa1101245.