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Table 2 Contact tracing results of smear-positive pulmonary and other tuberculosis patients of the cluster.

From: A Mycobacterium tuberculosiscluster demonstrating the use of genotyping in urban tuberculosis control

  Number of contacts examined Number of contacts examined with TST Number of tuberculosis infections Proportion of tuberculosis infections among those tested Tuberculosis cases
Mr. X 3 1 1 100 Case 2
Case 2 23 14 1 7 Case 3
Case 4 0 0 0 0  
Case 9 24 5 0 0  
Case 10 50 41 1 2  
Case 11 194 154 24 16 (Case 16)
Case 13 45 33 0 0  
School 1,730 964 40 4 Case 15
Case 14 1 0 0 0 Case B
Case 18 11 4 0 0 Case C
Case 22 31 15 1 7  
Case 23 4 4 1 25  
Case D 3 3 3 100  
Case 25 10 2 0 0  
Hospital 100 92 1 0  
Case 28 32 8 3 38  
Other 67 32 3 9 Case A
Total 2,328 1,372 79 5.8 6
  1. Cases with a number are culture-confirmed; cases with a letter are culture-negative cases epidemiologically linked to the cluster. Case 16 (in brackets) was diagnosed with latent TB infection and later developed TB (see also Results).