Tiffany Pinckney poses for a portrait in the Harlem neighborhood of New York on April 1, 2020. After a period of quarantine at home separated from her children, she has recovered from COVID-19. Pinckney became one of the nations first donors of "convalescent plasma." Using the blood product is experimental but scientists hope it could help treat the seriously ill and plan to test if it might offer some protection against infection for those at high risk. (AP Photo/Marshall Ritzell)

In this March 26, 2020 photo provided by Tiffany Pinckney, she donates blood for a study at a hospital in New York after recovering from COVID-19. “It is definitely overwhelming to know that in my blood, there may be answers,” said Pinckney, 39, (Courtesy Tiffany Pinckney via AP)

Tiffany Pinckney poses for a portrait in the Harlem neighborhood of New York on April 1, 2020. After a period of quarantine at home separated from her children, she has recovered from COVID-19. Pinckney became one of the nations first donors of "convalescent plasma." Doctors around the world are dusting off a century-old treatment for infections: Infusions of blood plasma teeming with immune molecules that helped survivors beat the new coronavirus. (AP Photo/Marshall Ritzell)

Tiffany Pinckney poses for a portrait in the Harlem neighborhood of New York on April 1, 2020. After a period of quarantine at home separated from her children, she has recovered from COVID-19. Pinckney became one of the nations first donors of "convalescent plasma." Doctors around the world are dusting off a century-old treatment for infections: Infusions of blood plasma teeming with immune molecules that helped survivors beat the new coronavirus. (AP Photo/Marshall Ritzell)