- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03040687
Efficacy of B7A BSIgG Against E. Coli Strain B7A Challenge
Protective Efficacy of Orally Delivered Bovine Serum Immunoglobulin (BSIgG) Specific for the Colonization Factor CS6 Following Challenge With the CS6-expressing Enterotoxigenic E. Coli (ETEC) Strain B7A
Study Overview
Status
Conditions
Detailed Description
Enterotoxigenic Escherichia coli (ETEC) is one of the most common causes of infectious diarrhea in children in resource limited countries, and is also a frequent cause of traveler's diarrhea in civilian and military travelers to endemic countries. ETEC strains express a variety of colonization factors (CF) that help them attach to the intestinal wall. Each colonization factor has one or more surface antigens (CS). One of the major surface antigens of ETEC is CS6 (Coli surface antigen 6).
Vaccines and treatments to prevent ETEC disease are under development. Some of these target specific enterotoxins or colonization factors. For over 40 years, we have used ETEC human challenge studies to understand the ETEC disease process, immune response, and more recently, to determine whether treatments or vaccines are protective or effective in mitigating disease. B7A is the only CS6 expressing ETEC challenge strain currently used.
A modality that has shown some success in the prevention of diarrhea is passive, oral administration of bovine milk IgG with specific activity against viral, bacterial and parasitic enteropathogens. Passive oral administration of Bovine Serum Immunoglobulins (BSIgG) may protect against ETEC-mediated infectious diarrhea. The hypothesized mechanism of protection stems from the passive administration of bovine anti-tip adhesion or fimbriae antibodies preventing their adherence in the human small intestine (the initial step in pathogenesis), thereby preventing downstream pathogenic processes and symptomatic illness. This study will establish the foundation for evaluating BSIgG products against numerous ETEC CFs.
This study will explore if anti-B7A and anti- CS6 BSIgG provides protection against oral challenge with B7A in healthy adult volunteers. There will be two inpatient admissions of approximately 30 subjects (up to 60 total). They will receive one of three investigational products (IP) three times daily following meals beginning 2 days prior to challenge. Each volunteer will be challenged with CS6 expressing ETEC B7A on Day 0. The investigational product/placebo will be administered for a total of 7 days, or until antibiotic treatment has been administered. The investigators hypothesize that anti-CS6 BSIgG will provide protection against B7A mediated moderate to severe diarrhea upon challenge.
Study Type
Enrollment (Actual)
Phase
- Phase 1
Contacts and Locations
Study Locations
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Maryland
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Baltimore, Maryland, United States, 21205
- Johns Hopkins Center for Immunization Research
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-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Male or female between 18 and 50 years of age, inclusive.
- General good health, without significant medical illness, abnormal physical examination findings or clinical laboratory abnormalities as determined by principal investigator (PI) or PI in consultation with the research monitor and sponsor.
- Demonstrate comprehension of the protocol procedures and knowledge of ETEC illness by passing a written examination (pass grade ≥ 70%)
- Willing to participate after informed consent obtained.
- Available for all planned follow-up visits.
- Negative serum pregnancy test at screening and negative serum and/or urine pregnancy test on the day of admittance to the inpatient phase for female subjects of childbearing potential. Females of childbearing potential must agree to use an efficacious hormonal or barrier method of birth control during the study. Abstinence is acceptable. Female subjects unable to bear children must have this documented (e.g., tubal ligation or hysterectomy).
Exclusion Criteria:
General health criteria
- Presence of a significant medical condition, (e.g. psychiatric conditions or gastrointestinal disease, such as peptic ulcer, symptoms or evidence of active gastritis or gastroesophageal reflux disease, inflammatory bowel disease, alcohol or illicit drug abuse/dependency, or other laboratory abnormalities which in the opinion of the investigator precludes participation in the study.
- Immunosuppressive illness or Immunoglobulin A (IgA) deficiency (serum IgA < 7 mg/dL or below the limit of detection of assay)
- Evidence of confirmed infection with HIV, HBsAg, or Hepatitis C Virus (HCV), with confirmatory assays.
- Use of any investigational product within 30 days preceding the receipt of the investigational products, or planned use during the active study period
- Significant abnormalities in screening lab hematology or serum chemistries, as determined by PI or PI in consultation with the research monitor and sponsor.
- Lactation or breastfeeding.
Research-related exclusions applicable to challenge
- History of microbiologically confirmed ETEC or cholera infection in last 3 years.
- Occupation involving handling of ETEC or Vibrio cholerae currently, or in the past 3 years.
- Travel to countries where ETEC or cholera infection is endemic (most of the developing world) within 3 years prior to dosing.
- Symptoms consistent with Travelers' Diarrhea concurrent with travel to countries where ETEC infection is endemic (most of the developing world) within 3 years prior to dosing, OR planned travel to endemic countries during the length of the study.
- Vaccination for or ingestion of ETEC, cholera, or E coli heat labile toxin within 3 years prior to dosing.
- Any prior experimental infection with ETEC strain B7A.
Study-specific Exclusion Criteria (potential increased risk or complicating outcome ascertainment)
- Abnormal stool pattern (fewer than 3 per week or more than 3 per day).
- History of diarrhea in the 2 weeks prior to planned inpatient phase.
- Regular use of laxatives, antacids, or other agents to lower stomach acidity (regular defined as at least weekly).
- Use of antibiotics during the 7 days before receipt of any investigational
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Quadruple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Anti-CS6 group
Anti-CS6 BSIgG and challenge strain CS6-expressing ETEC (B7A)
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Experimental: Anti-whole cell B7A
Anti- whole cell B7A (killed) BSIgG and challenge strain CS6-expressing ETEC (B7A)
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Experimental: control Immunoglobulin group
Negative Control (Nonhyperimmune BSIgG placebo) and challenge strain CS6-expressing ETEC (B7A)
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Safety of Serum Derived Bovine Immunoglobulins (BSIgG)
Time Frame: 28 days
|
Number of Participants with adverse events in groups receiving B7A- and CS6- hyperimmune (BSIgG) compared with the group receiving the nonhyperimmune product.
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28 days
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Efficacy of B7A and CS6- Hyperimmune Bovine Serum Immunoglobin to Protect Against Moderate to Severe Diarrhea After Challenge With the CS6 Expressing ETEC Strain B7A
Time Frame: 28 days
|
Comparison of the number and percentage of volunteers in the arms receiving the B7A- and CS6 BSIgG vs the arm receiving the nonhyperimmune BSIgG who develop moderate to severe diarrhea.
|
28 days
|
Collaborators and Investigators
Investigators
- Principal Investigator: Kawsar R Talaat, MD, Johns Hopkins Center for Immunization Research
Publications and helpful links
General Publications
- Porter CK, Riddle MS, Alcala AN, Sack DA, Harro C, Chakraborty S, Gutierrez RL, Savarino SJ, Darsley M, McKenzie R, DeNearing B, Steinsland H, Tribble DR, Bourgeois AL. An Evidenced-Based Scale of Disease Severity following Human Challenge with Enteroxigenic Escherichia coli. PLoS One. 2016 Mar 3;11(3):e0149358. doi: 10.1371/journal.pone.0149358. eCollection 2016.
- McKenzie R, Porter CK, Cantrell JA, Denearing B, O'Dowd A, Grahek SL, Sincock SA, Woods C, Sebeny P, Sack DA, Tribble DR, Bourgeois AL, Savarino SJ. Volunteer challenge with enterotoxigenic Escherichia coli that express intestinal colonization factor fimbriae CS17 and CS19. J Infect Dis. 2011 Jul 1;204(1):60-4. doi: 10.1093/infdis/jir220.
- Freedman DJ, Tacket CO, Delehanty A, Maneval DR, Nataro J, Crabb JH. Milk immunoglobulin with specific activity against purified colonization factor antigens can protect against oral challenge with enterotoxigenic Escherichia coli. J Infect Dis. 1998 Mar;177(3):662-7. doi: 10.1086/514227.
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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