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Table 2 Screening for contacts grouped by sputum grade of index patients

From: A household survey on screening practices of household contacts of smear positive tuberculosis patients in Vietnam

Positivity grade of index casesa No of Index patient No of contacts Contacts per index case Contacts went for screening n (%) Secondary cases with positive smear; n (%)
3+ 144 563 3.9 75 13.3 3 4.0
2+ 183 699 3.8 75 10.7 3 4.0
1+ 610 2249 3.7 265 11.8 9 3.4
Scanty 154 607 3.9 59 9.7 5 8.5
Total 1091 4118 3.8 474 11.5 20 4.2
  1. aBased on the International Union Against Tuberculosis and Lung Disease (IUATLD)-recommended grading of sputum smear microscopy results.