According to Centers for Disease Control and Prevention (CDC) guidelines, which of the following individuals would be considered positive for the tuberculin skin test? (Select all that apply.)
a. A 5-mm induration in an HIV-infected individual
b. A 10-mm induration in an individual with no risk factors for tuberculosis
c. A 10-mm induration in a child younger than 4 years old
d. A 10-mm induration in an HIV-negative individual who uses illicit injected drugs
e. A 5-mm induration in a foreign-born individual
f. A 5-mm induration in an individual from a low-income group
ANS: A, C, D
5 mm or more is positive in patients with HIV, close contacts with TB, a history of TB, or IV drug abuse and unknown HIV status. 10 mm or more is positive in persons who are foreign-born, are IV drug abusers and HIV-negative, are low income, reside in residential facilities, or are children younger than age 4. A 15-mm result is positive in a person with no TB risk factors.
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