Inclusion Criteria:  One-time or frequent visitors in care facilities of the INH group who want to be tested for SARS-CoV-2 voluntarily employees (HCW) in care facilities of the INH group who want to be tested voluntarily Successful declaration of consent via the UKK Corona web tool  Exclusion Criteria:  Visitors and employees in care facilities of the INH group with signs of SARS-CoV-2 infection No participants in the context of the study are in principle: one-time and frequent visitors in care facilities of the CNH group employees in care facilities of the CNH group Residents in care facilities of the CNH and the INH group