Of 1,118 patients with COVID-19 at a university hospital in Switzerland during October 2020-June 2021, we found 83 (7.4%) had probable or definite healthcare-associated COVID-19. After in-hospital exposure, we estimated secondary attack rate at 23.3%. Transmission was associated with longer contact times and with lower cycle threshold values among index patients.
Keywords: COVID-19; SARS-COV-2; Switzerland; coronavirus disease; cross-infection; infection control; infectious disease transmission; nosocomial infections; risk factors; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.