Mycobacterium tuberculosis contact score
| Variable | Weight assigned |
| Relationship to TB index case | |
| No known TB contact | 0 |
| Non-household TB contact | 1 |
| Relative/other contact in household with TB | 2 |
| Secondary caregiver (care provider during day) in household with TB | 3 |
| Primary caregiver in household with TB | 4 |
| Infectivity of TB index case | |
| No known TB contact | 0 |
| Sputum acid-fast negative | 2 |
| Sputum acid-fast positive | 4 |
| Type of exposure to TB index case | |
| No known exposure | 0 |
| Lives and sleeps in different house | 1 |
| Lives and sleeps in same house | 2 |
| Sleeps in same room | 3 |
| Duration (total hours) average contact per day with TB index case | |
| No known contact | 0 |
| 0–3 h | 1 |
| 4–7 h | 2 |
| 8–11 h | 3 |
| ⩾12 h | 4 |
| Total contact score (maximum = 15) |
TB, tuberculosis.