Inclusion Criteria:  Aged ≥ 18 years Having given free and informed written consent Being affiliated to the center national security system social Patients infected by SARS-COV-2 with positive RT PCR on nasopharyngeal swab and without symptoms (fever, cough, anosmia, diarrhea) will be included in "experimental" Group 1. Patients infected by SARS COV 2 with positive RT PCR on nasopharyngeal swab and presenting at least one symptom will be included in Group 2 "control". Participants not infected by SARS-COV-2 with negative RT PCR on nasopharyngeal sample and showing no symptoms on Day 0 and Day 7 will be included in Group 3 "healthy controls".  Exclusion Criteria:  - Patient whose life expectancy is less than 3 months