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Updated: Aug 9, 2026

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test
Published on: April 9, 2012
Yield of pulmonary tuberculosis cases by employing two screening methods in a community survey
P G Gopi1, R Subramani, K Sadacharam
1Tuberculosis Research Centre, Chennai, India.
Objective:
To compare the yield of tuberculosis (TB) cases by two screening methods.
Setting:
Two disease surveys conducted in Tiruvallur, south India.
Results:
Of bacteriologically confirmed cases, 60% were identified by symptom inquiry alone whereas 82% were identified using chest radiography (CXR).
Conclusion:
The prevalence of TB was underestimated by both methods. The total cases in this community can be estimated by multiplying the number of identified cases by a correction factor (CF) of 1.7 when symptom inquiry alone is used or 1.2 when CXR is used. The CF may be different in other settings.
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