Prevalence of infection among unvaccinated children for tuberculosis surveillance
Chakraborty, A.K.; Ganapathy, K.T. and Gothi, G.D. (1980) Prevalence of infection among unvaccinated children for tuberculosis surveillance. Indian J Med Res, 72. pp. 7-12.
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A survey was carried out among 12,535 children in the age group 0-9 years of 90 villages to study the possible variation in the prevalence of tuberculous infection among the unvaccinated children in a village depending upon the varying prevalence of BCG scars in the same population. In each village, all the children in the age group of 0-9 years were registered and examined for the presence or absence of the BCG scar. Each child was tuberculin tested with 1 TU RT 23 with tween 80 and the reaction read between 72 and 96 h. Two proportions were calculated in each village viz., the proportion with BCG scars and that of infected children among those without scar and the villages were distributed by these two proportions. There was no evidence of any association between the two proportions. In none of the villages any association was seen between the two. In view of this finding, it is felt that the simple method of periodic tuberculin testing of the population in younger age groups could be developed into a method of tuberculosis surveillance even in areas where direct mass BCG vaccination is given. This would appear to be the cheapest, practicable and technically appropriate method of studying the overall tuberculosis situation.
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