A seroconversion test for SARS-Cov-2 will be offered to all the employees of a care institution, which has treated 240 patients hospitalized for COVID disease between 28/02 and 30/04/2020. The seroconversion test will be with a questionnaire to determine: - whether the subject has shown signs of infection in the last 3 recent months - if the subject has been in contact with COVID-diagnosed subjects (RT-PCR diagnosis or scanner) outside of the activity or within the professional activity (patient or colleague) - Working conditions during the period - The level of knowledge and respect of the barrier measures practices. - Respect for distance during meals professional. Overall seroprevalence and stratified seroprevalence by care and administrative areas will be determined.
Diagnostic Test: Sars-Cov-2 serology
Measurement of overall seroprevalence of SARS-Cov-2 in an hospital staff
Other Name: serology
Inclusion Criteria:
- Subject who worked at Saint Joseph Saint Luke's Hospital during the epidemic wave
(male or female).
- Free and informed consent
- Social security affiliation
Exclusion Criteria:
- Subject refusal
- Subject on leave during the entire period