Convalescent plasma was discussed as a therapeutic option early in the course of the COVID-19 pandemic. However, until the onset of the pandemic, only the results of mostly small single-arm studies in other infectious diseases were available, which did not prove efficacy. In the meantime, the results of more than 30 randomized trials of COVID-19 convalescent plasma (CCP) for treatment of COVID-19 are available 1. Despite the heterogeneity of the results, conclusions for an optimal use are possible.
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