Main outcome: Incidence of SARS-CoV-2 infection
The diagnosis of SARS-CoV-2 infection was performed using RT-PCR on
nasopharyngeal swab (Allplex 2019-nCoV assay, Seegene) (Online
supplement 2). 24 An RT-PCR multiple variant assay was
used for the detection of α and β/γ variants (ID™ SARS-CoV-2/UK/SA
Variant Triplex (id Solutions) and for genome sequencing.