Table 2 The proportion of contacts diagnosed with TB who share a strain with their index case.
From: Transmission events revealed in tuberculosis contact investigations in London
Risk factors | (Number pairs with indistinguishable isolates)/(total number of pairs) (%) | p-value | |
|---|---|---|---|
Overall | 67/85 | (79%) | N/a |
Index case pulmonary | 65/81 | (80%) | 0.15 |
Index case extrapulmonary | 2/4 | (50%) | |
Index case smear positive pulmonary | 54/68 | (79%) | 0.75 |
Index case smear negative pulmonary | 10/12 | (83%) | |
Index case UK born | 26/30 | (87%) | 0.19 |
Index case non-UK born | 41/55 | (75%) | |
Contact UK born | 30/35 | (86%) | 0.19 |
Contact non-UK born | 37/50 | (74%) | |
Both index and contact UK born | 20/23 | (87%) | 0.26 |
Either index or contact or both non-UK born | 47/62 | (76%) | |
Both index and contact non-UK born | 31/43 | (72%) | 0.12 |
Either index, contact or both UK born | 36/42 | (86%) | |
Both index and contact have one or more social risk factors | 11/11 | (100%) | 0.06 |
Either index, contact or both have no social risk factors | 55/70 | (75%) | |
Child contact | 10/11 | (91%) | 0.29 |
Adult contact | 57/74 | (77%) | |
Index case female | 17/23 | (74%) | 0.50 |
Index case male | 50/62 | (81%) | |
Contact female | 30/38 | (79%) | 0.98 |
Contact male | 37/47 | (79%) | |
Both index and contact female | 7/10 | (70%) | 0.76 |
Both index and contact male | 27/34 | (79%) | |
Index and contact different sex | 33/41 | (80%) | |
