Tuberculosis or TB (short form for Tubercles Bacillus) is a common and often deadly infectious disease caused by various strains of mycobacteria, usually Mycobacterium tuberculosis in humans.
There are also other ways of contracting tuberculosis. As shown in this picture, pulmonary tuberculosis is contracted from inhaling infected droplets (of cough or sneeze).
Here's a short video on Tuberculosis.
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