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A high proportion of COVID-19 infections among U.S. health care personnel appear to go . According to the Morbidity and Mortality Weekly Report (MMWR), 1 in 20 health care workers sampled in 12 states tested positive for antibodies for COVID-19, and 69% of those with antibodies had never been diagnosed with the disease. The report added, “COVID-19 antibodies were less common among workers who reported using a face covering for all patient encounters and more common among those who reported a shortage of personal protective equipment.” (MMWR , 8/31/20)