Tuberculosis (TB) is a disease caused by TB bacteria. TB bacteria are spread through the air when someone who is sick with a contagious type of TB disease coughs or sneezes. Anyone who is nearby when this happens is at risk for breathing in TB bacteria, and possibly becoming sick with TB disease. Most commonly, TB bacteria cause disease in our lungs, but TB can also affect any other part of the body. Generally, lung and throat TB are the only contagious forms of the disease.
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