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Tuberculin test can be read after 24 hours in adolescent children.

OBJECTIVE
To assess readability of 24-h tuberculin response in adolescent school children.


DESIGN
Prospective observational study in school.


SUBJECTS
601 healthy adolescent children.


INTERVENTIONS
Tuberculin (1TU PPD RT23 Tween80) was administered and indurations at 24 and 72 h were compared.


MAIN OUTCOME MEASURE
Tuberculin reaction at 24 h.


RESULTS
One hundred twelve children (18.6%) had a positive tuberculin reaction. Prevalence of tuberculin positivity was least (14.2%) in the 10-year age-group and maximum in the 13-year age-group (21.2%). When individual values of tuberculin reaction at 24 and 72 h were compared, a significant difference was noted irrespective of the tuberculin status (t = 8.46, p = 0.001). However, when tuberculin reaction was considered as positive or negative, this difference was not significant (t = 1.89, p > 0.05).


CONCLUSIONS
Tuberculin status in adolescents can be read as positive or negative at 24 h, irrespective of their bacillus Calmette-Guérin scar status.