Impact Study of Cholera Vaccination in Endemic Areas - Clinical Surveillance
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Cholera. Basic parameters: No limits · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Democratic Republic of the Congo
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Cholera Control in Endemic Regions of Africa: Clinical Surveillance and Cholera Shedding Study in the Context of Mass Vaccination Campaigns, Democratic Republic of the Congo
Overview
This project aims to fill this essential knowledge gap by assessing the impact of oral cholera vaccine mass campaigns in 2 sites (urban and rural) in DRC, described in this protocol. The evidence generated from this project will be key to develop future strategies regarding cholera vaccine use in endemic settings, including places with higher burden in terms of cholera mortality.
Detailed description
The project will comprise three different components:
1. Clinical cholera surveillance to measure cholera diseases incidence in selected African hotspots targeted by vaccination. 2. Serial serological surveys to measure the prevalence of recent cholera infection (within the last 12 months). 3. Identification and follow up of individuals with positive V. cholerae shedding (symptomatic or asymptomatic) among sero-survey participants and among household members of cholera confirmed cases.
The present protocol relates to the setup of clinical surveillance and the follow up of individuals with positive V. cholerae shedding identified through clinical surveillance, in DRC.
This protocol will allow us to assess if a large vaccination campaign reaching high coverage in cholera hotspot in Africa can allow sustained control of cholera for at least two years, by fulfilling the following specific objectives:
* To measure cholera incidence rates following the mass vaccination campaign in two cholera hotspots in Africa. * To assess the duration of shedding among vaccinated and unvaccinated individuals and the duration of viable V. cholerae in the peri-household environment. * To measure the secondary cholera attack rates (symptomatic and asymptomatic) at household level among vaccinated and unvaccinated individuals following the identification of an index case in a given household. * To describe the global genetic diversity of V. cholerae strains in the study areas and within households affected by cholera. * To develop sustainable surveillance methods that could be applied in other hotspots in Africa and elsewhere aiming to monitor the impact of the cholera control program.
Primary outcome measures
- To better characterize cholera transmission in cholera hotspot in Africa and assess the impact of a large vaccination campaign reaching high coverage on sustained control of cholera transmission for at least two years. [Time frame: 2 years]
Secondary outcome measures (4)
- 1. To retrospectively study surveillance data, and prospectively measure cholera incidence rates of medically-attended confirmed cases following the mass vaccination campaign in two cholera hotspots in Africa. [Time frame: 2 years]
- 2. To assess the duration of shedding among vaccinated and unvaccinated individuals and the duration of viable V. cholerae in the peri-household environment. [Time frame: one year]
- 3. To measure the secondary cholera attack rates (symptomatic and asymptomatic) at household level among vaccinated and unvaccinated individuals following the identification of an index case in a given household. [Time frame: one year]
- 4. To describe the global genetic diversity of V. cholerae strains in the study areas and within households affected by cholera. [Time frame: 2 years]
Eligibility criteria
For Surveillance in study CTCs
Inclusion criteria
- All patients presenting at the time of the study to any selected Cholera Treatment Center/Cholera Treatment Unit (CTC/CTU), matching the case definition and giving his/her consent (or assent for children 8 to 17 years old) to participate in the study will be eligible.
Exclusion criteria
- Patients who decline to participate will be excluded from the study.
Follow up of individuals with active cholera shedding:
Inclusion criteria
- present to any selected CTC/CTU, match the case definition, participate to the clinical surveillance activity and test positive to RDT OR
- Be a household member of a person respecting inclusion criteria 1. AND for whom the head of the household has provided verbal consent to participate AND giving his/her consent (or assent for children 8 to 17 years old) to participate in the study will be eligible.
Exclusion criteria
\- Individuals who decline to participate will be excluded from the study, as well as households for whom the head of the household (and his or her representative) decline the participation of his/her household.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Other
Study locations
Democratic Republic of the Congo · 1 center
- Anais Broban — Goma
Identifiers
NCT: NCT04853186 · 2104-WT · 215689/Z/19/Z