Evaluation of Prevalence and Risk Factors of Persistent COVID-19 in Immunocompromised Patients

Prevalence of persisting SARS-CoV-2 infection among immunocompromised patients defined as the persistence or the recurrence of symptoms and signs (fever, dyspnea, hypoxemia, changes on chest-X ray or CT scan) and positive SARS-CoV-2 PCR ≥ 21 days after the time 0 (day of the first test positive for SARS-CoV-2 infection)