Tuberculosis of the lungs is called pulmonary tuberculosis . When tubercle bacilli are inhaled into the lungs , they are either destroyed by white blood cells or surrounded by special cells and fibers in the infected area of the lung , forming tiny nodules called tubercles . If the immune system is effective , the bacteria are kept from multiplying and an active case of tuberculosis does not develop . In some cases , however , the bacteria enter the bloodstream or lymphatic system and are carried to...











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