A high proportion of COVID-19 infections among U.S. healthcare personnel appear to go undetected, according to a report on Monday in the Morbidity and Mortality Weekly Report of the U.S. Centers for Disease Control and Prevention.
Between April and June, among more than 3,000 frontline workers in 12 states, roughly 1 in 20 had antibody evidence of a previous COVID-19 infection, but 69% of those infections had never been diagnosed.
Among those with antibodies to the novel coronavirus, about one-third did not recall having symptoms in the preceding months, nearly half did not suspect that they had been infected, and some two-thirds had never had a positive COVID-19 test.
Infections among frontline healthcare personnel may be going undetected, the study authors say, because some infections may be only minimally symptomatic or asymptomatic and also because personnel with symptoms may not always have access to testing.
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.
The researchers call for more frequent testing of healthcare personnel and the universal use of face coverings in hospitals.
