Table 1 The Tuberculosis (TB) Contact Score. Maximum score per subject = 18
Tuberculosis Contact Score (TCS) | Pre-assigned weight |
|---|---|
Infectivity of the index case1 | |
No known TB contact | 0 |
Unknown sputum smear status | 1 |
Sputum acid-fast2 negative | 2 |
Sputum acid-fast2 1+ | 3 |
Sputum acid-fast2 2+ | 4 |
Sputum acid-fast2 3+ | 5 |
Sputum acid-fast2 4+ | 6 |
Type of exposure to index case1 | |
No known/unknown exposure | 0 |
Index case lives and sleep in different house | 1 |
Index case lives and sleep in same house | 2 |
Index case lives and sleep in same room | 3 |
Index case lives and sleep in same bed | 4 |
Duration (total hours) of contact per average day with index case1 | |
No known/unknown duration of contact | 0 |
0–3 h | 1 |
4–7 h | 2 |
8–11 h | 3 |
≥ 12 h | 4 |
Duration of TB symptoms in index case1 | |
No symptoms or unknown duration of symptoms | 0 |
< 3 weeks | 1 |
4–7 weeks | 2 |
8–11 weeks | 3 |
≥ 12 weeks | 4 |