application For The Use Of Convalescent Plasma To Treat People With COVID-19. Plasma Is The Liquid Part Of Blood That Carries Blood Cells. Convalescent Plasma is Collected From People Who Have Recovered From COVID-19. It Is Then Transfused Into Someone With An Active Coronavirus Infection. It Is Thought That Antibodies Found In The Convalescent Plasma Can Help Fight The Coronavirus Infection.