The Grand Est region is one of the most affected regions in France during the first wave of the COVID-19 epidemic. A significant increase in the number of patients hospitalized for SARS-CoV 2 infection at the University Hospitals of Strasbourg (HUS) led to a sudden saturation of their capacities. Hospital workers appear to be a population at particular risk for this new infectious agent. The percentage of hospital workers who have been in contact with the virus or have contracted COVID-19 is unknown. The objective of this work is to determine the prevalence of SARS-CoV-2 positive serologies among hospital staff screened from June 22, 2020 to November 1, 2020 following a screening campaign offering serological testing to all volunteer HUS professionals.