During the Zika epidemic in 2016, concerns arose that the mosquito-borne virus could be transmitted accidentally through blood transfusions. But a new study published Wednesday suggests the risk of that occurring is low.
Just nine of more than 3.9 million blood donations individually screened from across the continental U.S. between June 2016 and August 2017 were positive for Zika, according to the study, which was led and funded by the American Red Cross. Of those nine donations, only four were from donors who had signs of...