Fig. 4. Secondary cases distributions and onward infections by Hospital Onset COVID19 Infection category.

a the percentage of cases with each number of secondary cases after adjusting for cases involved in transmissions but not represented in the dataset. b The percentage of each HOCI category case with at least 1 onward infection. Error bars represent 95% credible intervals. COCA Community onset community associated; positive test up to 14 days before or within 2 days after hospital admission. COSHA Community onset suspected hospital associated; positive test up to 14 days before or within 2 days after admission, with discharge from hospital within 14 days before test. HOIHA Hospital onset intermediate hospital associated; positive test 3–7 days after hospital admission, (*) with no discharge from hospital in 14 days before the specimen date. HOSHA Hospital onset suspected hospital associated; positive test 8–14 days after admission or 3–14 days after admission with discharge from hospital in 14 days before test. HOHA Hospital onset hospital associated; positive test 15 or more days after hospital admission. Classification of patient cases according to likely source of infection (community or hospital-acquired) is based on SAGE criteria¹⁵. Number of cases per HOCI category is shown in Table 1.