The SARS-Cov2 pandemic remains associated with many concerns. One of the them is the real frequency of likely re-infection and subsequently the level of protection conferred by the acquired immunity following primary-infection. We propose to analyze a large set of laboratory data produced since the early beginning of the SARS-Cov2 spread in the French population to identify recurrent infection events and, more generally, gain insight about infection kinetics.

Inclusion criteria:

- People with at least one positive SARS-Cov2 RT-PCR result with a known sampling date

Exclusion criteria:

- Patient refusing to participate in research

French population with a positive SARS-Cov2 diagnosis documented through a positive RT-PCR result

NC