A client with no history of immunosuppressive disease has a Mantoux tuberculin skin test. The results indicate an area of induration that is 8 mm in size. How should the nurse interpret this result?

Induration of 15 mm or more is considered positive for clients in low-risk groups. More than 5 mm of induration is considered a positive result for clients with known or suspected human immunodeficiency virus infection, persons with organ transplants, persons in close contact with a known case of tuberculosis, and those with a chest x-ray study suggestive of previous tuberculosis. More than 10 mm of induration is considered positive in all other high-risk groups, such as intravenous drug users.