Prevalence of TB in a community is estimated by:

Ans. (a) Tuberculin testRef: K. Park 23rd ed. /185* Tuberculin Test is the only way of estimating the prevalence of infection in a community.# A positive test indicates past or present infection by Mycobacterium tuberculosis.# Remember: a positive tuberculin test is NOT a confirmatory diagnostic of M.TB.* Sputum smear examination (Z-N stain) by direct microscopy is the diagnostic choice for TB case detection.* Chest X-Ray is a supportive diagnostic test for TB.* Montoux test is also a screening test for TB. A positive test indicates current or past infection.