Physicians were the group with the highest frequency of positive tests (61/582, 10.5%), whereas clerical workers and technicians had the lowest frequency (5/137, 3.6%). Frequencies of positive tests were compared according to selected variables using multivariable logistic regression models. For those who tested positive and for those who tested positive but who were asymptomatic, we checked the laboratory and clinical data as of 22 May to calculate the time necessary for HCWs to then test negative and to verify whether symptoms developed thereafter. Occupational and clinical characteristics of HCWs who underwent nasopharyngeal swab testing for the detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in a university hospital from 24 February 2020 to 31 March 2020 were collected. We aimed to assess in this group the attack rate of asymptomatic carriers and the symptoms most frequently associated with infection. The management of healthcare workers (HCWs) exposed to confirmed cases of coronavirus disease 2019 (COVID-19) is still a matter of debate. 8 Infectious Diseases Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy Centre for Multidisciplinary Research in Health Science (MACH), University of Milan, Milan, Italy. 7 Occupational Health Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.6 Clinical Laboratory, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.5 Medical Direction, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.4 Infectious Diseases Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.3 Epidemiology Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.Electronic address: 2 Epidemiology Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy. 1 Infectious Diseases Unit, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
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