Tubercle Bacilli Stain
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Tuberculosis is spread through the air when people who have active TB in their lungs cough , spit, speak, or sneeze .   People with latent TB do not spread the disease.  Active infection occurs more often in people with HIV/AIDS and in those who smoke .  Diagnosis of active TB is based on chest X-rays , as well as microscopic examination and culture of body fluids.  Diagnosis of latent TB relies on the tuberculin skin test (TST) or blood tests.