- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01080716
Safety and Efficacy Study of WRSS1, a Shigella Sonnei Vaccine Candidate
October 10, 2018 updated by: U.S. Army Medical Research and Development Command
Safety, Immunogenicity, and Efficacy Studies of WRSS1, a Live Attenuated Shigella Sonnei Vaccine Candidate, in Healthy Thai Adults
This study is an inpatient trial to determine the safety, immunogenicity and efficacy of the WRSS1 candidate vaccine in healthy Thai adult volunteers.
Study Overview
Status
Completed
Detailed Description
This study is designed as 2 parts.
- Part 1 is a blinded, placebo-controlled inpatient trial in a total of 20 volunteers (14 vaccinees and 6 controls) to determine the safety and immunogenicity. Volunteers will be vaccinated with a single oral dose of 104 colony forming unit (cfu) of WRSS1 or placebo given with bicarbonate buffer.
- Part 2 will be started approximately 60 days after WRSS1 vaccination. This part is an inpatient phase II efficacy trial involving a challenge with the S.sonnei 53G of 10 vaccinees from the first part and 10 naïve controls.
Study Type
Interventional
Enrollment (Actual)
30
Phase
- Phase 2
- Phase 1
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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-
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Bangkok, Thailand, 10400
- Vaccine Trial Centre, Faculty of Tropical Medicine, Mahidol University
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-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 38 years (Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- 20-40 years old; male or female;
- General good health as determined by a screening evaluation no greater than 30 days before admission;
- Normal bowel habits (grade 1-2 stools - no more than one to two stools per day with at least one stool per 2 days;
- Sexually active females willing to use birth control (birth control pills, injection hormonal contraceptive, implant hormonal contraceptive, hormonal patch, IUD, sterilization for effective contraceptive methods, spermicidal products and barrier methods are considered acceptable)during the entire study (starting from study day -30) and for 3 months after completion of the study (approximately a total of 6 months) or sexually inactive females (no sexual contact). Volunteers who take birth control pills will be required to use additional contraceptive methods for the remaining days of the cycle after discharge from the VTC (alteration of gastrointestinal functions from the oral vaccine or challenge strain may lead to unpredictable efficacy of pills);
- Will be available and willing to continue participation in the second part of the study if he/she has been randomly selected;
- Pass the Assessment of Understanding of the consent form.
Exclusion Criteria:
- An acute or chronic medical condition or a clinically significant abnormality on physical exam that, in the opinion of the investigator, would render vaccination or challenge as unsafe;
- Current use of iron or zinc supplements within the past 7 days; current use of antacids (H2 blockers, omeprazole, OTC agents) or immunosuppressive drug;
- Unwillingness to follow the study procedures
- Currently breastfeeding, pregnant (βHCG +) or planning to become pregnant within 3 months after the completion of the study;
- Allergy to quinolone, sulfa, and penicillin classes of antibiotics;
History of any of the following conditions within the past 10 years:
- Arthritis (two or more episodes of joint pain and swelling),
- Gastrointestinal disease (diagnosed by a doctor as having irritable bowel disease, Crohn's disease, ulcerative colitis (biopsy confirmed), celiac disease, stomach or intestinal ulcers), or
- Dyspepsia (digestion or heartburn requiring medication more than once per week);
- Lifetime previous history of known/suspected Shigella diarrhea (except for volunteers who receive vaccines from Part 1) ;
- Lifetime history of, or active gallbladder disease;
- HLA B27 Ag (+); Anti-HIV (+); HBsAg(+); Anti HCV IgG Ab(+); abnormal screening tests judged to be clinically significant as judged by PI or sub-PI (Values are out of the acceptable abnormal range from the table in the protocol) other than mild anemia in females (Hct = 0.33-0.36);
- Lifetime history of participation in Shigella study (except for volunteers who receive vaccines from Part 1);
- Concurrent participation in another experimental vaccine or drug study within the past 30 days(except for volunteers who receive vaccines from part1);
- Serological positive for Shigella sonnei: anti-Shigella sonnei LPS IgG antibody titer in serum >800 (except for volunteers who receive vaccines from Part 1);
- Receipt of antimicrobial drugs for any reason or acute illness or fever >=38 oC within 7 days before vaccination or challenge;
- Individuals with household contacts that are immunocompromised;
- History of major abdominal surgery or laparotomy for any reason in the past 3 years, or abdominal scar of unclear origin;
- Presence of significant ova or parasite or Shigella bacteria in the stool;
Receipt of any of the following (does not include the WRSS1 vaccine):
- a licensed live, attenuated vaccine within the 30 days of challenge
- a licensed subunit or killed vaccine within the 14 days of the challenge
- a blood product, including immunoglobulin, in the 90 days before the challenge
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Experimental: Part 1/Arm 1 of Study: WRSS1 vaccine
WRSS1 is a live attenuated S. sonnei vaccine candidate derived from the Mosely strain of S.sonnei
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Single, oral dose of WRSS1
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Placebo Comparator: Part 1/Arm 2 of Study: Placebo vaccine
Placebo
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Placebo vaccine
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Experimental: Part 2/Arm 1 of Study: S. sonnei 53G
10 volunteers from Study Arm 1/Part 1 (WRSS1 vaccine) plus 4 alternates from Arm 1/Part 1 are given 53G S. sonnei
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Subject from Part 1/Arm 1 of Study are given 53G S. sonnei
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Active Comparator: Part 2/Arm 2 of Study: S sonnei 53G
10 subjects (naïve controls) plus 4 alternates are give 53G S sonnei
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10 naïve controls are given S. sonnei 53G
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Number of Participants With Adverse Events
Time Frame: Up to 12 months
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Overview of AEs highlighting all AEs, withdrawals and deaths related to AEs
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Up to 12 months
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Number of Participants With Shigella Induced Clinical Disease in Part 2
Time Frame: 0-5 days
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Study Part 2-Frequency of Shigella induced clinical disease defined as one or more of diarrhea, dysentery or fever in vaccinees and controls following challenge with S. sonnei 53G.
Transmissibility of disease will be evaluated by the presence of fecal shedding in control subjects.
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0-5 days
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Count of Subjects With Normal and Abnormal Clinical Laboratory Values During Parts 1 and 2 of Study
Time Frame: Days 1, 7, 14, and 28
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Count of subjects in Parts 1 and 2 with normal and abnormal clinical laboratory values after samples taken on days 1, 7, 14, and 28.
Abnormal lab values are determined clinically significant by the PI
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Days 1, 7, 14, and 28
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Investigators
- Study Director: Ladaporn Bodhidatta, MD, Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences
- Principal Investigator: Punnee Pitisuttithum, MBBS, Vaccine Trial Centre, Faculty of Tropical Medicine, Mahidol University
- Study Director: Carl Mason, MD, Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
May 1, 2010
Primary Completion (Actual)
September 1, 2010
Study Completion (Actual)
December 1, 2011
Study Registration Dates
First Submitted
December 23, 2009
First Submitted That Met QC Criteria
March 2, 2010
First Posted (Estimate)
March 4, 2010
Study Record Updates
Last Update Posted (Actual)
November 13, 2018
Last Update Submitted That Met QC Criteria
October 10, 2018
Last Verified
October 1, 2018
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Digestive System Diseases
- Infections
- Signs and Symptoms, Digestive
- Gastrointestinal Diseases
- Gastroenteritis
- Intestinal Diseases
- Gram-Negative Bacterial Infections
- Bacterial Infections
- Bacterial Infections and Mycoses
- Enterobacteriaceae Infections
- Diarrhea
- Dysentery, Bacillary
- Dysentery
- Physiological Effects of Drugs
- Immunosuppressive Agents
- Immunologic Factors
- Complement Inactivating Agents
- Vaccines
- Complement Factor H
Other Study ID Numbers
- A-15647
- 09-0021 (Other Identifier: NIH/DMID)
- 1609 (Other Identifier: WRAIR IRB)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Yes
IPD Plan Description
Mahidol University and National Institutes of Health will have access to study data.
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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