True statement regarding `tuberculine test' is ?
Used for diagnosis of TB
Measures incidence of disease
More than 1 Omm induration in 72 hrs. indicates positive test
Measure immunity status
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.