Table 4. Number needed to screen to find an additional case of HIV, by strategy, Vizianagaram district, India, November-December 2010.
| Strategy | Number with Prior HIV status Unknown | Number (%) HIV Positive | Number Needed to Screen (NNS) |
| HIV testing for all TB patients | 348 | 14 (4.0) | 25 |
| HIV testing for TB suspects excluding TB patients | 1854 | 70 (3.7) | 26 |
| HIV testing for all TB suspects including TB patients | 2202 | 84 (3.8) | 26 |
| HIV testing of all TB suspects in the age group 25–54 years | 1331 | 75 (5.6) | 17 |
TB –Tuberculosis; HIV –Human immunodeficiency virus; NNS-Number needed to screen.