[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100630392":3},{"organization":4,"armGroups":7,"interventions":23,"overallOfficials":32,"centralContacts":33,"locations":43,"responsibleParty":59,"collaborators":61,"id":74,"slug":75,"hasResults":76,"nctId":77,"briefTitle":78,"officialTitle":79,"acronym":32,"eligibilityCriteria":80,"healthyVolunteers":81,"sex":82,"minAge":83,"maxAge":32,"enrollmentInfo":84,"targetDuration":32,"studyType":87,"phases":88,"briefSummary":90,"conditions":91,"keywords":93,"overallStatus":46,"whyStopped":32,"lastUpdateSubmitDate":100,"lastUpdatePostDateStruct":101,"startDateStruct":104,"completionDateStruct":106,"leadSponsor":108,"locationsCount":109},{"fullName":5,"class":6},"Albert B. Sabin Vaccine Institute","OTHER",[8,14,19],{"label":9,"type":10,"description":11,"interventionNames":12},"Standard Dosing Arm (Two Weeks Interval)","ACTIVE_COMPARATOR","Participants received the second OCV dose per the recommended dosing schedule 2 weeks after the initial dose.",[13],"Drug: Euvichol-S Oral Cholera Vaccine",{"label":15,"type":16,"description":17,"interventionNames":18},"Extended Interval Dosing Arm (Three Months Interval)","EXPERIMENTAL","Participants received the second OCV dose 3 months after the initial dose.",[13],{"label":20,"type":16,"description":21,"interventionNames":22},"Annual Booster Dosing Arm (Twelve Months Interval)","Participants received the second OCV dose 12 months after the initial dose.",[13],[24],{"type":25,"name":26,"description":27,"armGroupLabels":28,"otherNames":29},"DRUG","Euvichol-S Oral Cholera Vaccine","Parallel-group, phase IV, open-label, randomized, non-inferiority trial\n\nArms:\n\nThree distinct arms, each balanced in a 1:1:1 ratio:\n\nStandard Dosing Arm (Two Weeks Interval) Extended Interval Dosing Arm (Three Months Interval) Annual Booster Dosing Arm (Twelve Months Interval)\n\nEach dosing arm will have the following three age strata:\n\nChildren aged 1-4 years Children aged 5-14 years Adults aged 15 years and older",[20,15,9],[30,31],"cholera: inactivated oral","Euvichol",null,[34,39],{"name":35,"role":36,"phone":37,"phoneExt":32,"email":38},"Samuel Kariuki, BVM, PhD","CONTACT","+254 722232467","samkariuki2@gmail.com",{"name":40,"role":36,"phone":41,"phoneExt":32,"email":42},"Cecilia Mbae, PhD","+254 722485819","cmkathure@gmail.com",[44],{"facility":45,"status":46,"city":47,"state":32,"zip":32,"country":48,"countryCode":49,"cosmosGeoPoint":50,"geoPoint":55,"contacts":56},"KEMRI","RECRUITING","Nairobi","Kenya","KE",{"type":51,"coordinates":52},"Point",[53,54],36.81667,-1.28333,{"lat":54,"lon":53},[57],{"name":58,"role":36,"phone":32,"phoneExt":32,"email":32},"Samuel Kariuki",{"type":60,"investigatorFullName":32,"investigatorTitle":32,"investigatorAffiliation":32,"oldNameTitle":32,"oldOrganization":32},"SPONSOR",[62,64,66,68,71],{"name":63,"class":6},"Kenya Medical Research Institute",{"name":65,"class":6},"Washington State University",{"name":67,"class":6},"Massachusetts General Hospital",{"name":69,"class":70},"Kenya Ministry of Health","OTHER_GOV",{"name":72,"class":73},"Nairobi City County","UNKNOWN","100630392","phase-4-extended-dosing-intervals-trial-for-oral-cholera-vaccine-kenya-100630392",false,"NCT07487077","Extended Dosing Intervals Trial for Oral Cholera Vaccine, Kenya","A Phase IV Parallel-Group, Open-Label, Randomized Non-Inferiority Trial Evaluating Immunogenicity of Extended Dosing Intervals for Euvichol-S Oral Cholera Vaccine, Nairobi, Kenya","Inclusion Criteria:\n\n* Residents of Mukuru, Nairobi, Kenya\n* Individuals aged 1 year and above\n* Voluntary written informed consent for study participation provided by an individual or his\u002Fher legally acceptable representative. Children aged 13 years and above will also provide assent, with parental permission required for all children.\n* Ability to comply with study requirements and attend follow-up visits during the study period.\n\nParticipants must be in good health, as determined by medical history, physical examination, and the clinical judgment of the investigators. Clinical judgment will consider factors such as the absence of acute illness or, uncontrolled or severe chronic conditions that may affect participation in the study.\n\n* Lactating women may be enrolled following clinical assessment and informed consent. The vaccine contains killed, formalin-inactivated bacteria that are not systemically absorbed and act locally in the gastrointestinal tract.\n\nExclusion Criteria:\n\n* Known history of hypersensitivity reactions to other vaccines.\n* Pregnant women, due to differences in immune response. A pregnancy test will be administered to all female participants who have reached menarche and are under 50 years.\n* Reported diarrhea or abdominal pain lasting 2 weeks or longer within 6 months prior to study initiation; to avoid confounding the vaccine's effects with pre-existing conditions.\n* Received a cholera vaccine in the last 24 months: Ensures that the study assesses the vaccine in question without interference from prior vaccinations.\n* History of cholera disease in the last 24 months: Recent history of cholera infection can interfere with the measurement of vaccine response.\n* Severely malnourished individuals as determined by mid-upper arm circumference (MUAC) and age-specific body mass index (BMI) measurements: malnutrition can affect immune response and vaccine efficacy. In children below 510 years, severe malnutrition will be defined as MUAC \\\u003C 11.5 cm, for older children (age 5 - 17y) severe malnutrition will be defined as BMI-for-age z score \\\u003C -3 (WHO Child Growth Standards), for children \\\u003C10y, presence of bilateral pitting oedema will be considered indicative of severe malnutrition. For adults (18y and above), severe malnutrition will be while in older children and adults it will be defined as BMI \\\u003C 16.\n* Non-HIV\u002FAIDS immunosuppressive condition or on immunosuppressive therapy: Such conditions can significantly alter vaccine response.\n* Presence of bleeding disorders or medical contraindication for blood draws: To ensure participant safety during blood collection.\n* Participation in another clinical trial with investigational product dosing within 6 months prior to study initiation.\n* An individual thought to have difficulty in participating in the study due to severe chronic diseases, based on the judgment of the investigator.\n* An individual thought to have difficulty participating in the study due to reasons, such as significant logistical constraints, or communication barriers, or likely to be away for a period of at least 3 consecutive months in the first 6 months of enrollment based on the judgment of the investigator.",true,"ALL","1 Year",{"count":85,"type":86},1071,"ESTIMATED","INTERVENTIONAL",[89],"PHASE4","Background: Despite efforts to control cholera, outbreaks continue to occur in Kenya. Oral cholera vaccines (OCVs) are a critical tool in cholera prevention strategies. This study evaluates the immunogenicity of extended dosing intervals for Euvichol-S, a WHO-prequalified OCV, in a Phase IV non-inferiority trial.\n\nOverview Design: This trial is a parallel-group, open-label, randomized, non-inferiority study. It aims to compare the immune response of three dosing schedules of the Euvichol-S OCV: a standard 2-week interval, a 2-month interval, and a 12-month interval. The study will enroll 1071 participants, stratified by age into three groups (1-4 years, 5-14 years, 15+ years. The primary endpoint is the plasma vibriocidal geometric mean titer (GMT) measured two weeks after the second dose.\n\nPrimary Objective: To assess and compare the immune response to Euvichol-S measured by vibriocidal GMT two weeks after the second vaccine dose across different dosing intervals.\n\nStudy Sites: The study will be conducted in the Mukuru informal settlement in Nairobi, Kenya, a high-priority cholera hotspot area. The Kenya Medical Research Institute (KEMRI) will manage the study, leveraging its established relationship with the community.\n\nStudy Population: Inclusion criteria include residents of Mukuru ≥1 year, who are healthy as determined by medical history and physical examination. Exclusion criteria include pregnant women, severe malnutrition, and non-HIV immunosuppressive conditions or severe chronic diseases.\n\nStudy Interventions: Participants will be randomized to one of three dosing arms stratified by age: a standard 2-week interval, a 3-month interval, or an annual booster interval. Participants will receive the Euvichol-S OCV according to the assigned schedule. The follow-up period for participants will be 18 months, during which they will undergo regular scheduled visits and additional unscheduled visits as needed (i.e., standard dosing arm: six scheduled visits; 3-month interval arm: 7 visits; annual booster arm: 6 visits). Blood samples will be collected at each vaccination visit and 14 days later and at 6 months, 1 year and 18 months after enrollment to measure plasma vibriocidal GMT and other immunological markers. Older children in the PBMC cohort will have two additional samples collected five days after each vaccine dose and a larger blood volume (10mls) collected at 14 days after the second dose.\n\nOutcome Measures: Primary outcome measures include the plasma vibriocidal GMT two weeks post-second dose. Secondary outcomes include antibody seroconversion rates, longitudinal GMT changes, incidence of cholera disease, and the safety profile of the vaccine. The PBMC sub-cohort will provide detailed insights into memory B cell and plasmablast responses.\n\nSample Size: The study will enroll 1071 participants with equal distribution across the three dosing arms and age strata. The PBMC sub-cohort will include 240 participants (40 per arm among 5-14 years, 40 per arm 1-4 years), with detailed immunological assessments.\n\nData Analysis: The immunogenicity of the vaccine across different dosing schedules will be compared to determine non-inferiority. Data will be analyzed descriptively to summarize the by-grade incidence of treatment-emergent adverse events (AEs), serious adverse events (SAEs), and other safety indicators.\n\nImpact: This trial aims to generate evidence on the optimal dosing schedule for Euvichol-S OCV, potentially informing future vaccination strategies in cholera-endemic regions and improving cholera prevention in resource-limited settings.",[92],"Cholera Vaccination",[94,95,96,97,98,99],"Cholera","extended dosing","Euvichol-S","OCV","vaccination","immunization","2026-03-17",{"date":102,"type":103},"2026-03-23","ACTUAL",{"date":105,"type":103},"2025-10-31",{"date":107,"type":86},"2028-06",{"name":5,"class":6},1]