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(Supplementary Figure 1). Patients underwent surgery in 78 hospitals from 16 countries, predominantly in Italy (n= 44), UK (n= 28) and Spain (n= 20). 112 patients with a previous positive swab were matched to 448 patients with no positive swab. In the propensity score matched model, previous SARS-CoV-2 infection was associated with increased odds of pulmonary complications compared to no infection (10⋅ 7%[12/122] versus 3⋅ 6%[16/448], adjusted odds ratio 3⋅ 84, 95% confidence interval 1⋅ 51-9⋅ 74, p= 0⋅ 004, Supplementary Figure 2). When split by time from swab to surgery, both pulmonary complications and mortality were lowest at least 4weeks after notification of a positive swab test (Table 1). However, 71⋅ 3%(87/122) of patients had surgery within 4 weeks of SARS-CoV-2 infection in this series. There are significant limitations of these data, including risk of selection bias and a small sample size …