“Erratum to: High SARS-CoV-2 seroprevalence but no severe course of COVID-19 disease among people on opioid agonist treatment in Zurich: a cross-sectional study: Erratum to Swiss Med Wkly. 2022;152:w30122 (DOI 10.4414/smw.2022.w30122)”, Swiss Med Wkly, vol. 152, no. 0506, p. w30149, Feb. 2022, doi: 10.4414/SMW.2022.w30149.