Table 2 Characteristics of the four cohorts.

CohortsnSamplesDateAreaCOVID-19
Pre-pandemic
individuals
4914912017–2019FranceNaïve
Hospitalized patients
with COVID-19
51161January to March 2020Paris, FranceConfirmed
Mildly symptomatic
individuals
2092093–4 March 2020Crépy-en-Vallois, FranceSuspected
Healthy blood donors20020020–24 March 2020Lille, FranceUnknown