True about montoux is -
Ans. is 'a' i.e., False negative in fulminant disease . A positive tuberculin test indicates hypersensitivity to tuberculoprotein, it may be due to : - Active infection - Subclinical infection - Past infection - BCG vaccination . In overwhelming tuberculosis (fulminant cases) due to depressed cellular immunity montoux test may be false negative.
False negative in fulminant diseases
If once done, next time it is always positive
Results are given in terms of positive & negative
Indurations given in terms of length & breadth