The U.S. Food and Drug Administration placed a partial clinical hold on studies conducted by Gilead Sciences assessing the combination of magrolimab plus azacitidine due to concerns of unexpected serious adverse events between study arms.

A protein called CD47 that helps damaged cells avoid destruction by the immune system may be contributing to severe cases of Covid-19, researchers suggested in a report. In other news, Gilead Sciences Inc.’s intravenous antiviral drug remdesivir helped keep high-risk Covid-19 patients out of the hospital in a randomized trial.