What does a positive tuberculin skin test show?

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Multiple Choice

What does a positive tuberculin skin test show?

Explanation:
A positive tuberculin skin test reflects a delayed-type hypersensitivity response to TB antigens, shown as a localized induration — a firm, raised area at the injection site. This induration is measured in millimeters and assessed 48–72 hours after the intradermal PPD injection. Erythema alone without a raised induration is not considered positive, and a pustule is not the expected reaction. The classic positive finding is the induration, often with surrounding redness, indicating prior TB exposure or infection.

A positive tuberculin skin test reflects a delayed-type hypersensitivity response to TB antigens, shown as a localized induration — a firm, raised area at the injection site. This induration is measured in millimeters and assessed 48–72 hours after the intradermal PPD injection. Erythema alone without a raised induration is not considered positive, and a pustule is not the expected reaction. The classic positive finding is the induration, often with surrounding redness, indicating prior TB exposure or infection.

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