Abstract
Introduction
Soon after the start of the coronavirus disease 19 (COVID-19) pandemic, in the absence of a vaccine and specific treatments, the collection and storage of plasma from donors who had had COVID-19 was considered promising for evaluation in clinical studies or as a starting material for the manufacture of experimental anti-SARS-CoV-2 hyperimmune immunoglobulins1. Early non-randomised studies2-5 suggested the safety and potential efficacy of transfusions of COVID-19 convalescent plasma (CCP) as a treatment for hospitalised patients. Driven by these observations, extensive donation campaigns were implemented, and many patients started to be treated worldwide, in the context of expanded access programmes. However, the initial enthusiasm was tempered as good quality randomised trials and systematic reviews were published. It is now agreed that CCP treatment, although safe, is ineffective for the treatment of most hospitalised COVID-19 patients. [ ... ]
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