Swiss Medical Weekly 2022. 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 Medical Weekly. 152, 0506 (Feb. 2022), w30149. DOI:https://doi.org/10.4414/SMW.2022.w30149.