The World Health Organization on Monday (Dec. 6) warned against using convalescent plasma to treat patients with COVID-19, saying that, despite its initial therapeutic promise, current evidence shows plasma does not improve survival or reduce the need for mechanical ventilation. “[T]he WHO makes a strong recommendation against the use of convalescent plasma in patients with non-severe illness, and a recommendation against its use in patients with severe and critical illness, except in the context of a randomised controlled trial (RCT),”...