Contacts of patients with TB | Contacts of controls | p Value contacts vs controls* | |||
Positive | p Value impact of HIV co-infection | Positive | p Value impact of HIV co-infection | ||
n (%) | n (%) | ||||
TST results | |||||
All | 161 (73) | <0.001 | 132 (75) | <0.001 | 0.58 |
HIV positive | 27 (49) | – | 6 (33) | – | 0.29 |
HIV negative | 134 (80) | – | 126 (80) | - | 0.91 |
Exposed to smear-negative and culture-negative index cases | 34 (60%) | – | – | – | – |
Exposed to smear-negative and culture-positive index cases | 23 (68%) | – | – | – | – |
Exposed to smear-positive index cases | 71 (85%) | – | – | – | – |
ELISpot results | |||||
All | 79 (36) | 0.85 | 53 (30) | 0.28 | 0.25 |
HIV positive | 19 (35) | – | 3 (17) | – | 0.24 |
HIV negative | 60 (36) | – | 50 (32) | – | 0.42 |
Exposed to smear-negative and culture-negative index cases | 16 (28%) | – | – | – | |
Exposed to smear-negative and culture-positive index cases | 8 (24%) | - | - | - | - |
Exposed to smear-positive and culture-positive index cases | 42 (50%) | – | – | – | – |
↵* p Value for difference in rates of positive test results between contacts of TB cases and contacts of controls.
ELISpot, enzyme-linked immunospot; TB, tuberculosis; TST, tuberculin skin testing.