Zürcher , Kathrin, Catrina Mugglin , Franziska Suter-Riniker , Peter M. Keller, Matthias Egger , Sandro Müller , Michael Fluri, Matthias Hoffmann , and Lukas Fenner. “Seroprevalence of SARS-CoV-2 in Healthcare Workers from Outpatient Facilities and Retirement or Nursing Homes in a Swiss Canton”. Swiss Medical Weekly 151, no. 3334 (August 20, 2021): w30021. Accessed November 24, 2024. https://smw.ch/index.php/smw/article/view/3055.