FIGURE 1.

Flow chart of the Co‐HCW study. The number of hospital staff members (n) is provided. Reasons for exclusions are given. Hospital staff members, including healthcare workers and administration staff, working at predefined areas at Jena University Hospital (JUH) were eligible for study inclusion. Working areas were classified into three categories according to the risk to deal with COVID‐19 positive patients (see Table S1 for the definition). Note that we decided not to assign laboratory personal to a pre‐categorized risk area because a proportion dealt with COVID‐19 related clinical specimens but there was no patient contact