Effect of influenza, pneumococcal and SARS-CoV-2 vaccination on the incidence and severity of COVID-19 in health care workers at a single institution (epidemiologic study)

Objective. To study the effect of influenza, pneumococcal and SARS-CoV-2 vaccination on the incidence and severity of COVID-19 course in health care workers. Patients and Methods. We examined 547 health care workers divided into group 1 (no history of influenza and pneumococcal vaccination, n = 281) and groups vaccinated between August and October 2020 (before SARS-CoV-2 epidemic II): Group 2 agai…