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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.