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Table 1 The Tuberculosis (TB) Contact Score. Maximum score per subject = 18

From: Identification of subclinical tuberculosis in household contacts using exposure scores and contact investigations

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
  1. 1Index case: Adult with confirmed pulmonary tuberculosis. 2Direct fluorescent microscopy with Auramin staining