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Secondary transmission of COVID-19 in preschool and school settings in northern Italy after their reopening in September 2020: a population-based study.

Public Health Unit, Azienda Unità Sanitaria Locale - IRCCS di Reggio Emilia, Reggio Emilia, Italy. Epidemiology Unit, Azienda Unità Sanitaria Locale - IRCCS di Reggio Emilia, Reggio Emilia, Italy. Center for Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Section of Public Health, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Italy. Clinical and Experimental Medicine PhD Program, University of Modena and Reggio Emilia, Modena, Italy. Department of Infectious Diseases, Istituto Superiore di Sanità, Rome, Italy. The members of the Reggio Emilia Covid-19 Working Group are listed under Investigators.

Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin. 2020;(49)
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Abstract

We report epidemiological investigations of transmission of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in 41 classes of 36 schools in Reggio Emilia province, northern Italy, from their reopening on 1 September to 15 October 2020. The overall secondary case attack rate was 3.2%, reaching 6.6% in middle and high schools. More timely isolation and testing of classmates could be effective in reducing virus transmission in this setting.