Study of SARS-CoV2 Virus (COVID-19) Seroprevalence in the Population of Creil Air Force Base (BA110)

The anti-SARS-CoV2 serological status will be measured on a blood sample collected at Day 0.

"Epidemiological data will be collected in a questionnaire that will be filled by participants at Day 0 (Visit 1), after 3 months (Visit 2) and after 9 months (Visit 3).~The questionnaire includes:~* medical data (height, weight, smoking, history of intense stress);~* socio-demographic data (age, gender, civil/military status, function/occupation, rank category, army, family status/home composition, housing conditions, etc.);~* clinical data : history of symptoms suggestive of COVID-19 in the last 3 months, current symptoms suggestive of COVID-19;~* use of care, hospitalization, work stoppage in the last 3 months;~* contact with people who are symptomatic or proven COVID-19."

Serological controls and a serum neutralization test will be performed on blood samples collected 3 months (Visit 2) and 9 months (Visit 3) after Day 0, respectively.