Evaluation of Serological Techniques for Screening for COVID-19 Infection at the University Hospital of Rouen

Inclusion Criteria: The inclusion criteria in the retrospective "Negative/Potentially Interfering" group are asfollows :

• Adult patient sampled prior to the onset of the COVID-19 epidemic (before January

• Patient presenting a coronavirus infection other than SARS-CoV-2, or other respiratoryviral infections (influenza, metapneumovirus)
• Patients for whom a serum is kept in the biocollection declared under the numberAC-2014-2293 and kept in the Institute of Clinical Biology, University Hospital ofRouen. The criteria for inclusion in the "acute point infection" group are as follows:
• Patients screened by a positive RT-PCR for an SARS-CoV-2 infection
• Patients aged ≥ 18 years old
• Patients taken in charge in the emergency room / in a unit / in COVID resuscitation atthe Rouen University Hospital.
• Patients having read and understood the briefing note
• Non-opposition to participation in the study The criteria for inclusion in the "Sequential acute infection" group are as follows:
• Patients with positive RT-PCR for CoV-2-SARS infection
• Patients aged ≥ 18 years old
• Taken care of in a COVID unit at the Rouen University Hospital
• Having read and understood the briefing note and signed the informed consent form The criteria for inclusion in the "Convalescent" group are as follows:
• Caregivers working at the UH of Rouen
• Screened by positive RT-PCR for SARS-CoV-2 infection,
• Healed for at least one month at the time of inclusion
• Having read and understood the briefing note and signed the informed consent form

Exclusion Criteria:

• Minor person
• Known Pregnancy
• Person deprived of liberty by an administrative or judicial decision or person placedunder judicial protection / subtutorship or guardianship
• Person not affiliated with social security
• Person who does not understand and speak French