Tuberculosis (TB) is an infectious disease that can affect people and animals and is caused by a bacterium called Mycobacterium tuberculosis that is generally found in the lungs but can attack any part of the body. Once TB disease develops, it can be very contagious and cause symptoms such as coughing, fever and fatigue. People with TB disease can spread the bacteria through the air when they cough, speak, sneeze, or sing. TB bacteria can live in the body without making you sick. This condition is called latent TB infection (LTBI). LTBI is not contagious and typically causes few or no symptoms. Although most people with latent TB infection never experience any symptoms, without treatment one in ten people with latent TB infection will develop TB disease.
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Provides background information on Tuberculosis including source and transmission.