Convalescent plasma therapy uses blood from people who've recovered from an illness to help others recover.

The U.S. Food and Drug Administration authorized convalescent plasma therapy for people with COVID-19. The FDA is allowing its use during the pandemic because there's no approved treatment for COVID-19.

Blood donated by people who've recovered from COVID-19 has antibodies to the virus that causes it. The donated blood is processed to remove blood cells, leaving behind liquid (plasma) and antibodies. These can be given to people with COVID-19 to boost their ability to fight the virus.
 
Source: Mayo Clinic

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