It is an infectious disease caused by Mycobacterium tuberculosis. There are two other types of Myco bacteria, causing TB, but are not so common in Sri Lanka. TB mainly affects the lungs (80%).Other organs which can fall victim to this bacterium include the brain, bones, spine, lymph nodes, eye and skin etc (20%) .ome patients with lung TB, however, do not produce bacteria-containing sputum and such are not infective to others. Therefore sputum examination is not only a reliable diagnostic tool, but also important to design and plan preventive measures.
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