The secondary objective is to determinate in what manner response of IgM anti-SARS-Co-V-2 relates to patient's immunity statute, in regards to the other so-called humain seasonal coronavirus.
The primary objective of the research is to study the relation between the presence and /or the anti SARS-Co-V-2 IgM level in an early stage of COVID-19 infection, and the evolution of the illness.