Blood samples from coronavirus patients are prepared for analysis as part of the TACTIC-R trial, in the Blood Processing Lab in the Cambridge Institute of Therapeutic Immunology and Infectious Disease, in Cambridge, England, Thursday, May 21, 2020. The new trial known as TACTIC-R is testing whether existing drugs will help prevent the body's immune system from overreacting, which scientists hope could prevent organ failure and death in COVID-19 patients. (AP Photo/Kirsty Wigglesworth, pool)
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