Convalescent plasma transfusion for immunocompromised viremic patients with COVID‐19: A retrospective multicenter study

This study aims to assess the safety, virological, and clinical outcomes of convalescent plasma transfusion (CPT) in immunocompromised patients hospitalized for coronavirus disease 2019 (COVID‐19). We conducted a retrospective multicenter cohort study that included all immunosuppressed patients with COVID‐19 and RNAemia from May 2020 to March 2023 treated with CPT. We included 81 patients with hematological malignancies (HM), transplants, or autoimmune diseases (69% treated with anti‐CD20). Sixty patients (74%) were vaccinated, and 14 had pre‐CPT serology >264 BAU/mL. The median delay between symptom onset and CPT was 23 days [13−31]. At D7 post‐CPT, plasma PCR was negative in 43/64 patients (67.2%), and serology became positive in 25/30 patients (82%). Post‐CPT positive serology was associated with RNAemia negativity (p