Estimation of annual risk of tuberculosis infection among children irrespective of BCG scar in the south zone of India.
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Date
2006-01
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Abstract
Objective: To estimate the proportion infected and compute Annual Risk of Tuberculosis Infection (ARTI) among
children irrespective of BCG scar and compare with that among children without BCG scar.
Methodology: Tuberculin survey was conducted in south zone of India as a part of the nation-wide survey to estimate the
ARTI in different parts of the country and ARTI was computed among children without BCG scar excluding children with
BCG scar. In this exercise, the tuberculin test results of children with BCG scar and irrespective of BCG scar were
considered for analysis and the results were compared.
Results: The prevalence of infection and ARTI estimated among children irrespective of BCG scar aged 1-9 years were
5.7% and 1.0% (95% C.I: 0.8-1.3) respectively. The corresponding figures among unvaccinated children were 5.9% and
1.0% (95% C.I: 0.7-1.4) respectively. The ARTI among children irrespective of BCG scar were similar to that among
unvaccinated children.
Conclusion: Estimation of proportion of children infected and computation of ARTI using mirror-image
technique could be undertaken among children irrespective of BCG scar among children aged either from 1-9 years or 5-9 years.
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Keywords
Prevalence of infection, ARTI
Citation
Gopi P G, Subramani R, Kolappan C, Prasad V Venkatesh, Narayanan P R. Estimation of annual risk of tuberculosis infection among children irrespective of BCG scar in the south zone of India. Indian Journal of Tuberculosis. 2006 Jan; 53(1): 7-11.