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Article

Nasopharyngeal Testing among Healthcare Workers (HCWs) of a Large University Hospital in Milan, Italy during Two Epidemic Waves of COVID-19

1
Infectious Diseases Unit, Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
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Epidemiology Unit, Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
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Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
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Clinical Laboratory, Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
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Medical Direction, Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
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Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy
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Department of Biomedical Sciences for Health, University of Milan, 20122 Milan, Italy
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Quality Unit, Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
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Occupational Health Unit, Foundation IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
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Centre for Multidisciplinary Research in Health Science (MACH), University of Milan, 20122 Milan, Italy
*
Author to whom correspondence should be addressed.
These authors equally contributed to this work.
Academic Editor: Jon Øyvind Odland
Int. J. Environ. Res. Public Health 2021, 18(16), 8748; https://doi.org/10.3390/ijerph18168748
Received: 25 June 2021 / Revised: 17 August 2021 / Accepted: 17 August 2021 / Published: 19 August 2021
Background: since October 2020, a second SARS-CoV-2 epidemic wave has hit Italy. We investigate the frequency of positive nasopharyngeal swabs among HCWs during the two waves and the association with occupation and demographic characteristics. Methods: this is a retrospective, observational study conducted in a large university hospital in Milan, Northern Italy. We defined two epidemic waves: 1st (February 2020–July 2020) and 2nd (August 2020–January 2021). Occupational and demographic characteristics of HCWs who underwent nasopharyngeal swabs for SARS-CoV-2 were collected. Results: in the 1st wave, 242 positive subjects (7.2%) were found among 3378 HCWs, whereas in the 2nd wave, the positive subjects were 545 out of 4465 (12.2%). In both epidemic waves positive NPSs were more frequent among HCWs with health-related tasks and lower among students (p < 0.001). However, in the 2nd wave, workers engaged in non-health-related tasks had a peak of 20.7% positivity. Among 160 positive HCWs in the 1st wave who were tested again in the 2nd wave, the rate of reinfection based on SARS-CoV2 RNA cycle quantification value was 0.6%. Conclusions: during the 2nd epidemic wave, we confirmed a significant impact of COVID-19 among HCWs. The rise of infection rate among HCWs seems to reflect the increasing spread of SARS-CoV-2 among the overall population. View Full-Text
Keywords: COVID-19; SARS-CoV-2; healthcare operators; reinfection; nasopharyngeal swab COVID-19; SARS-CoV-2; healthcare operators; reinfection; nasopharyngeal swab
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MDPI and ACS Style

Comelli, A.; Consonni, D.; Lombardi, A.; Viero, G.; Oggioni, M.; Bono, P.; Uceda Renteria, S.C.; Ceriotti, F.; Mangioni, D.; Muscatello, A.; Piatti, A.; Pesatori, A.C.; Castaldi, S.; Riboldi, L.; Bandera, A.; Gori, A. Nasopharyngeal Testing among Healthcare Workers (HCWs) of a Large University Hospital in Milan, Italy during Two Epidemic Waves of COVID-19. Int. J. Environ. Res. Public Health 2021, 18, 8748. https://doi.org/10.3390/ijerph18168748

AMA Style

Comelli A, Consonni D, Lombardi A, Viero G, Oggioni M, Bono P, Uceda Renteria SC, Ceriotti F, Mangioni D, Muscatello A, Piatti A, Pesatori AC, Castaldi S, Riboldi L, Bandera A, Gori A. Nasopharyngeal Testing among Healthcare Workers (HCWs) of a Large University Hospital in Milan, Italy during Two Epidemic Waves of COVID-19. International Journal of Environmental Research and Public Health. 2021; 18(16):8748. https://doi.org/10.3390/ijerph18168748

Chicago/Turabian Style

Comelli, Agnese, Dario Consonni, Andrea Lombardi, Giulia Viero, Massimo Oggioni, Patrizia Bono, Sara C. Uceda Renteria, Ferruccio Ceriotti, Davide Mangioni, Antonio Muscatello, Alessandra Piatti, Angela C. Pesatori, Silvana Castaldi, Luciano Riboldi, Alessandra Bandera, and Andrea Gori. 2021. "Nasopharyngeal Testing among Healthcare Workers (HCWs) of a Large University Hospital in Milan, Italy during Two Epidemic Waves of COVID-19" International Journal of Environmental Research and Public Health 18, no. 16: 8748. https://doi.org/10.3390/ijerph18168748

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