M-A: Convalescent plasma does not reduce mortality in COVID-19.

Association between convalescent plasma treatment and mortality in COVID-19: a collaborative systematic review and meta-analysis of randomized clinical trials – BMC Infectious Diseases

Related:

RCT: Another study shows convalescent plasma does not improve outcomes in critically ill patients with Covid-19.

RCT: Convalescent plasma does not improve outcomes and may be harmful to hospitalized patients with COVID-19.

NIH study shows no significant benefit of convalescent plasma for COVID-19 outpatients with early symptoms.

M-A: Convalescent plasma is safe but does not improve outcomes in the treatment of COVID-19.

RECOVERY Trial: No benefit from convalescent plasma in patients admitted to hospital with COVID-19.