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Nursing home resident that was exposed to another resident with TB. A mantoux test is positive if ___ mm of induration is seen.

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Final answer:

The Mantoux test for TB is positive if a certain size of induration is seen at the injection site.

Step-by-step explanation:

The Mantoux tuberculin skin test is used to screen for potential tuberculosis (TB) exposure. The test involves injecting tuberculin protein derivative into the skin. A positive result is indicated by redness, swelling, or hardness at the injection site, known as induration. The size of the induration is measured, and a positive test is typically defined as having an induration size of 10 mm or greater in most individuals, or 5 mm or greater in those with a high risk of TB exposure (e.g., immunocompromised individuals).

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