Inclusion Criteria:  Patients that underwent surgery performed by a surgeon in an operating theatre, AND They had a positive SARS-CoV-2 PCR swab or rapid antigen test (if PCR swab is not available) within 7 days before or 30 days after surgery. Patients can be included regardless of whether a specific variant is suspected or unknown  Exclusion Criteria:  They underwent minor procedures Their SARS-CoV-2 infection was diagnosed more than 7 days before surgery (regardless of their symptomatic status at the time of surgery) or beyond 30 days after surgery  All consecutive patients fulfilling inclusion criteria across all specialities should be captured.