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Healthcare institutions' recommendation regarding the use of FFP-2 masks and SARS-CoV-2 seropositivity among healthcare workers: a multicenter longitudinal cohort study.
Szajek K, Fleisch F, Hutter S, Risch M, Bechmann T, Luyckx VA, Güsewell S, Hirzel C, Cusini A, Group AS; AMICO Study Group. Szajek K, et al. Antimicrob Resist Infect Control. 2022 Jan 10;11(1):6. doi: 10.1186/s13756-021-01047-x. Antimicrob Resist Infect Control. 2022. PMID: 35012679 Free PMC article.