True statement regarding `tuberculine test' is ?: (A) Used for diagnosis of TB, (B) Measures incidence of disease, (C) More than 1 Omm induration in 72 hrs. indicates positive test, (D) Measure immunity status
Answer is C. Ans. is 'c' i.e., More than 10 mm induration in 72 hrs indicates positive test Repeat tuberculin test (two step testing) o Induration is measured, erythtna is not taken into account. Uses of tuberculin test o Diagnosing active infection in infants and young children. o Measure prevalence of infection. o Select susceptibles. o As an indication of sucessful vaccination.