************######################MONTOUX TEST(141)########## ERYTHMA : INDURATION : RESULT : INTERPRETATIONS REACTIONS ARE CLASSIFIED AS FOLLOWS: Positive : Induration measuring 10mm or more. Doubtful : Induration measuring between 5 and 9mm. Negative : Induration of less than 5mm. It should be noted that reactivity to tuberculin may be depressed or suppressed for as long as four weeks following viral infections,live-virus vaccines(e,g, measles, smallpox, polio, rubella, mumps, etc.) A positive tuberculin reaction does not necessary signify the presence of active disease. Further diagnostic procedures should be carried out before diagnosis of tuberculosis is made.