Inclusion Criteria:  Being a healthcare professional working in one of the hospitals where the study will take place Be aged ≥18 years; Cases: SARS-CoV-2 infection confirmed by PCR test and/or Rapid Antigen Test; Control: No evidence and/or record of past infection with SARS-CoV-2.  Exclusion Criteria:  Case: Confirmation of diagnosis test for SARS-CoV-2 without indication of specimen collection date. Control: Suspected SARS-CoV-2 infection.