Seroepidemiological Investigation of Coronavirus 2019 (COVID-19) Infection in Gabon

Study Overview
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Brief Summary
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Gabon is the 3rd country most affected by COVID-19 behind Cameroon and Democratic Republic of Congo in Central Africa, with 8860 cases and 54 deaths in critically ill patients, since the first confirmed case of COVID-19 on the 10th of March 2020 (https://africacdc.org/covid-19/). Most of the individuals infected by SARS-CoV-2 are asymptomatic and they represent a major source of viral spread. To date, African countries have been less affected by deaths caused by the Covid-19 pandemic compared to other countries. It is currently unknown why Africa has avoided more deaths and appears to not simply be due to a lack of testing, since the overall death rate has not increased. Better quality data on seroprevalence in different African regions and proven explanations of the differences between Africa and other continents, are urgently needed. The aim of this study is to learn about the proportion of people after a first pic of transmission, who have been exposed to COVID-19 in Gabon by testing for plasma antibodies to the SARS-CoV-2 virus. The overall goal of this study is to examine the trend of specific anti-SARS-CoV-2 antibodies in Gabonese population.

Detailed Description
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Based on its technical capacities (ELISA bench and multiparametric flow cytometer), we will provide evident data on the immune responses in Covid-19 infected patients. The quantification of antibodies against SARS-CoV-2 recombinant protein will be done by ELISA using Wantai ELISA total Ab. Meanwhile, data on clinical status will be recorded and classified using WHO patient form. Data obtained will be analyzed by a statistician based at CERMEL using robust models in compliance with the type of data generated.

Official Title
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Population-based Age-stratified Seroepidemiological Investigation of Coronavirus 2019 (COVID-19) Infection in Gabon

Conditions
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Laboratory Confirmed SARS-CoV-2 Infection Without Symptoms

Intervention / Treatment
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* Diagnostic Test: Wantai kit Elisa


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Persons of both sexes aged one year and older and residing for more than three months in the study area are eligible to participate in the study Exclusion Criteria: Any person not residing in the locality surveyed or any person residing for less than three months. Refusal to give informed consent and contraindication to venipuncture venipuncture.

Ages Eligible for Study
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Minimum Age: 1 Year

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Groupe 1<br>[1-15[ | Diagnostic Test: Wantai kit Elisa<br>* to mesure antibodies against SARSCov-2 recombinant antigen<br>|
| Group 2<br>[15- 30[ | Diagnostic Test: Wantai kit Elisa<br>* to mesure antibodies against SARSCov-2 recombinant antigen<br>|
| Group 3<br>[30-45[ | Diagnostic Test: Wantai kit Elisa<br>* to mesure antibodies against SARSCov-2 recombinant antigen<br>|
| Group 4<br>[45-60[ | Diagnostic Test: Wantai kit Elisa<br>* to mesure antibodies against SARSCov-2 recombinant antigen<br>|
| Group 5<br>60+ | Diagnostic Test: Wantai kit Elisa<br>* to mesure antibodies against SARSCov-2 recombinant antigen<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| seroprevelence on SARS-Cov- 2 infection in Gabon | assess the specific anti-SARS-CoV-2 antibodies in individuals and for modeling the evolution of the COVID-19 outbreak. | 4 Months |