Convalescent plasma is ineffective for covid-19

Lessons from the Placid Trial Convalescent plasma generated great enthusiasm in the earliest days of the coronavirus disease 2019 (covid-19) pandemic because of a plausible mechanism of action,1 its 100 year history of use in the treatment of other infectious diseases,2 and rapid availability from voluntary donors.3 In the linked PLACID Trial, Agarwal and colleagues (doi:10.1136/bmj.m3939)…

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