A Randomized Trial of Convalescent Plasma in Covid-19 Severe Pneumonia | NEJM (did not help)

No significant differences were observed in clinical status or overall mortality between patients treated with convalescent plasma and those who received placebo. (PlasmAr ClinicalTrials.gov number, NCT04383535. opens in new tab.) Source: A Randomized Trial of Convalescent Plasma in Covid-19 Severe Pneumonia | NEJM