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to catch TB from someone with LTB. In people who develop active TB of the lungs, also called pulmonary TB, the Mantoux test will often be positive. They are contagious and capable of passing the bacteria to others. TB can be transmitted by exhalation. Tiny droplets exhaled by someone with active TB can remain suspended in the air for several hours based on environmental conditions. Another person could then inhale the droplets and potentially become infected with TB. However,

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