HomeMore than half of Americans have had COVID infections -U.S. studyFILE PHOTO: First responders receive antibody testing for the coronavirus

FILE PHOTO: First responders receive antibody testing for the coronavirus

FILE PHOTO: A research assistant at the University of Arizona, prepares blood samples for antibody testing for the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., July 10, 2020. REUTERS/Cheney Orr/File Photo
FILE PHOTO: A general view of Centers for Disease Control
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