An Open Label Trial of Transfusion of COVID-19 Convalescent Plasma (CCP) to Patients With Moderate to Severe COVID-19

Marshall et al., NCT04412486, NCT04412486, Mar 2023
86 patient convalescent plasma late treatment study with results not reported over 3 years after completion.
29 convalescent plasma RCTs have results missing long after expected1-29
The trials report a total of 3,534 patients, with 15 trials having actual enrollment of 1,143, and the remainder estimated.
Marshall et al., 23 Mar 2023, USA, trial NCT04412486 (history).
Late treatment
is less effective