A Patient with a Chronic Cough Is Given a Tuberculin

Multiple Choice

A patient with a chronic cough is given a tuberculin skin test, which when properly read has a zone of induration greater than 15 mm. What does this mean?

A) Active infection with Mycobacterium tuberculosis
B) Active infection with any of the nontuberculous mycobacteria
C) Anergy
D) Antibody titer to M. tuberculosis
E) Previous infection with M. tuberculosis
F) Vaccination with bacillus Calmette-Guerin (BCG) vaccine only