This April 15, 2020 photo provided by New York Blood Center Enterprises shows vials of blood from donors for testing at the Blood Bank of Delmarva Christiana Donor Center in suburban Newark, Del. Survivors of COVID-19 are donating their blood plasma in droves in hopes it helps other patients recover from the coronavirus. And while the jury's still out, now scientists are testing if the donations might also prevent infection in the first place. New York Blood Center Enterprises via AP Photo