<prompt> Negative montoux test is when induration is -5mm10mm15 mm20 mm  <response>: Ans. is a i.e., 5 mm MethodIntradermal injection of PPD on flexor aspect of forearmExamined at 48-72 hoursInduration 10 mmInduration 5 mmInduration 6-9 mmPositiveNegativeEquivocalRepeat tuberculin test two step testing 