Write in brief about Mantous test.

Write in brief about Mantous test.
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Answer :

A dose of 5 tuberculin units of old tuberculin or an equivalent dose of PPD is injected intradermally. After 48 to 72 hours the reaction of the test is observed at the site of the injection. A positive reaction consists of a raised indurated area. induration measuring 10 mm or more is interpreted as positive for past or present infection with Mycobacterium tuberculosis. Induration of 5 to 9 mm is regarded as of doubtful significance. The induration of less than 5 mm is interpreted as a negative. The presence of erythema without induration is not significant.
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