The COVERT protocol was designed to assess, through a longitudinal analysis, the level of antibodies present in the serum of patients with COVID-19, the duration and the persistence of the humoral response in correlation with the severity of the disease.

Inclusion Criteria:

• Age ≥18 years old,
• Patient whose Covid-19 diagnosis has been confirmed by RT-PCR test (SARS-CoV-2 positive) from a nasopharyngeal swab/broncho alveolar lavage
• Patient whose severity of Covid-19 required hospital treatment
• Patient whose Covid-19 form is defined as moderate (stay in general ward) or severe (stay in ICU), based on the clinical evaluation conducted by the doctor
• Patient agreeing to participate in the study and having signed the informed consent.

Exclusion Criteria:

• Adult person subject to legal protection,
• Pregnant, parturient or breastfeeding woman
• Person not affiliated to a social security scheme or not beneficiary of such a scheme
• Person subject to a safeguard measure
• Person deprived of liberty by a judicial or administrative decision and woman hospitalized without consent under Articles L.3212-1 and 3213-1, which do not fall under Article L.1122-8 of the Public Health Code.