<prompt> True about montoux is -False negative in fulminant diseasesIf once done, next time it is always positiveResults are given in terms of positive negativeIndurations given in terms of length breadth  <response>: 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. 