True about mantoux is
A. False negative in fulminant diseasesB. If once done, next time it is always positive
C. Results are given in terms of positive & negative
D. Indurations given in terms of length & breadth. Always indicate active TB infection
E. None of the above
Ans. A. False negative in fulminant
diseases:
• False neg. Mantoux is found in Fulminant disease.
• Mantoux test is used to detect disease hypersensitivity to tubercular antigens. The results of the test are read as reactions (induration) in inn the horizontal transverse diameter of induration. An induration of: <6 mm is considered negative.
• False neg. Mantoux is found in Fulminant disease.
• Mantoux test is used to detect disease hypersensitivity to tubercular antigens. The results of the test are read as reactions (induration) in inn the horizontal transverse diameter of induration. An induration of: <6 mm is considered negative.
8-9
mm : doubtful
> 10 mm :taken as positive
It DOES NOT prove th the person is SUFFERING from the active disease.
. It doesn’t distinguish between active and latent infection.
. Tuberculin sensitivity slowly wanes with time. A repeat test may appear to be negative. However, a repeat test may exert BOOSTER EFFECT so that, another tuberculin test after 1-2 wks. later will be strong positive (> 20 mm) test.
> 10 mm :taken as positive
It DOES NOT prove th the person is SUFFERING from the active disease.
. It doesn’t distinguish between active and latent infection.
. Tuberculin sensitivity slowly wanes with time. A repeat test may appear to be negative. However, a repeat test may exert BOOSTER EFFECT so that, another tuberculin test after 1-2 wks. later will be strong positive (> 20 mm) test.
