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It enters through the nose it affects the lungs
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A tiny germ called tubercle bacillus, which is so small that only a microscope can detect it, causes tuberculosis. The germ enters the body through the nose, mouth and the windpipe and settles down in the lungs. It multiplies by millions and produces small raised spots called tubercles. Sometimes this germ is called Kock's bacillus and the disease, Kock's disease after the name of Prof. Kock (1843-1910) who discovered this germ in March 1882.
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