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Nicolas Banholzer and team use a variety of data to investigate the transmission of SARS-CoV-2 in two secondary schools in Switzerland in the presence and absence of mask wearing and air cleaners.

South africaCity ofUnited kingdomMonte carloNorthern capeSouth africanAziz sheikhMultidisciplinary centerUniversity of bernEdinburgh universityEducational department of the cantonSwiss national science foundationNational institute of allergySevere acute respiratory syndrome coronavirusCoronavirus diseaseCreative commons attribution license