A
A 43 year old with a history of tuberculosis treated with three drugs for 6 months, who has calcified granulomas on his chest X-ray.
B
A 17 year old with a lymph node biopsy growing Mycobacterium tuberculosis
C
A 51 year old nurse who was inadveently exposed to a patient with active pulmonary tuberculosis in an emergency room for 30 minutes
D
A 34 year old man with cough and expectoration for 4 weeks, not responding to oral amoxycilin and symptomatic management.