Several publications document the occurrence of symptoms that persist or occur late, more than 3 weeks after the first clinical manifestations of an SARS-COV2 infection. These manifestations may be related to thromboembolic or inflammatory complications, superinfections, or other mechanisms not yet well understood, including potentially related to the persistence of SARS-COV2. The identification of the observed clinical manifestations and their clinical and paraclinical description are essential to better understand the natural evolution of COVID-19, to clarify the pathophysiological mechanism of these possible late manifestations, and to identify potential management options for patients.~Since this type of event is infrequent, a large-scale national multicenter cohort study focusing on symptomatic patients is needed. In parallel, the prevalence of the main symptoms observed more than 3 weeks after the onset of a COVID-19 will be estimated through partnerships with existing cohort studies in the general population or in the population followed for COVID-19, still symptomatic or not at 3 weeks of infection.~Longitudinal implementation of bio-libraries will allow this cohort to also constitute a bridge between clinicians and researchers.
Several publications document the occurrence of symptoms that persist or occur late.~The identification of the observed clinical manifestations and their clinical and paraclinical description are essential to better understand the natural evolution of COVID-19, to clarify the pathophysiological mechanism of these possible late manifestations, and to identify potential management options for patients.~Since this type of event is infrequent, a large-scale national multicenter cohort study focusing on symptomatic patients is needed.