Spontaneous international multicenter retrospective and prospective observational study which objective is to evaluate the prevalence and risk factors of persistent SARS-CoV-2 infection within a population of hematology patients with humoral immunity deficiency.
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Prevalence of persisting SARS-CoV-2 infection among immunocompromised patients
Timeframe: Retrospective recruitment period will span from January 1st, 2022 to to the date of authorisation by hospital directorates following the Ethics Committees' approvals