Question

a positive tuberculin skin test indicates that a person has

o an active case of tuberculosis
o been exposed to tuberculosis
o a very poor prognosis
o a strong level of immunity to tuberculosis

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Explanation:

A positive tuberculin skin test means the person's immune system has reacted to the tuberculin (a protein from the tuberculosis bacteria). This reaction occurs because the person has been exposed to tuberculosis bacteria in the past. It does not necessarily mean the person has an active case of tuberculosis (further tests like chest X - rays and sputum tests are needed for that). A positive test also does not directly indicate a very poor prognosis or a strong level of immunity. Immunity is more complex and not simply determined by a positive skin test.

Answer:

been exposed to tuberculosis