“…3 . In the hospital-acquired SARS-CoV-2 infected patients, subgroup analysis showed a significant difference in the rates between all patients (Europe, multi-countries, Asia and America) [ 9 , 10 , 25 – 28 , 30 , 31 , 35 , 36 , 47 , 51 , 53 , 56 , 57 , 60 , 61 , 65 , 68 , 69 , 72 , 74 , 77 , 79 , 80 , 83 , 85 ]; and Europe only patients [1.1% (95% CI 0.5 to 1.6, n = 178, 12 studies, I 2 = 91%)] [ 10 , 25 – 27 , 35 , 47 , 53 , 56 , 60 , 61 , 77 , 79 ]; multi-countries only patients [4.7% (95% CI 3.6 to 5.9, n = 212, 2 studies, I 2 = 90%)] [ 9 , 51 ]; Asia only patients [0.7% (95% CI 0.0 to 1.4, n = 32, 9 studies, I 2 = 69%)] [ 28 , 31 , 36 , 57 , 65 , 68 , 74 , 83 , 85 ]; and America only patients [2.3% (95% CI 0.9 to 3.6, n = 32, 4 studies, I 2 = 10%)] [ 30 , 69 , 72 , 80 ], respectively; Fig. 4 .…”