Background: Due to the critical condition of COVID-19, it is necessary to evaluate the efficacy of administrating convalescent plasma to COVID-19 patients. Therefore, we decided to design a clinical trial to investigate the effect of convalescent plasma of patients recovered from COVID-19 on the treatment outcome of COVID-19-infected patients.
Materials And Methods: In this parallel randomized controlled clinical trial, patients in the intervention group received standard treatment plus convalescent plasma of patients recovered from COVID-19.