SARS-CoV-2 transmission in students of public schools of Catalonia (Spain) after a month of reopening
Llupià, Anna (Universitat de Barcelona. Facultat de Medicina i Ciències de la Salut)
Borrás Santos, Alícia (Universitat Autònoma de Barcelona. Escola Universitària d'Infermeria i de Fisioteràpia "Gimbernat")
Guinovart, Caterina (Institut de Salut Global de Barcelona)
Utzet, Mireia (Institut Hospital del Mar d'Investigacions Mèdiques)
Moriña, David (Universitat de Barcelona. Departament d'Econometria, Estadística i Economia Aplicada)
Puig, Joaquim (Universitat Politècnica de Catalunya. Departament de Matemàtiques)
Universitat Autònoma de Barcelona

Data:	2021
Resum:	SARS-CoV-2 transmission within schools and its contribution to community transmission are still a matter of debate. A retrospective cohort study in all public schools in Catalonia was conducted using publicly available data assessing the association between the number of reported SARS-CoV-2 cases among students and staff in weeks 1-2 (Sept 14-27th, 2020) of the academic year with school SARS-CoV-2 incidence among students in weeks 4-5. A multilevel Poisson regression model adjusted for the community incidence in the corresponding basic health area (BHA) and the type of school (primary or secondary), with random effects at the sanitary region and BHA levels, was performed. A total of 2184 public schools opened on September 14th with 778,715 students. Multivariate analysis showed a significant association between the total number of SARS-CoV-2 cases in a centre in weeks 1-2 and the SARS-CoV-2 school incidence among students in weeks 4-5 (Risk Ratio (RR) 1. 074, 95% CI 1. 044-1. 105, p-value <0. 001). The adjusted BHA incidence in the first two weeks was associated with school incidence in weeks 4-5 (RR 1. 002, 95% CI 1. 002-1. 003, p-value <0. 001). Secondary schools showed an increased incidence in weeks 4 and 5 (RR primary vs secondary 1. 709 95% CI 1. 599-1. 897, p-value <0. 001). Safety measures adopted by schools were not enough to stop related-to-school transmission in students and could be improved. The safest way to keep schools open is to reduce community transmission down to a minimum.
Ajuts:	Ministerio de Ciencia, Innovación y Universidades PGC2018-098676-B-100 Instituto de Salud Carlos III COV20/00115 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1049
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	PloS one, Vol. 16 (may 2021) , ISSN 1932-6203

DOI: 10.1371/journal.pone.0251593
PMID: 33979410

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