Tuberculosis (TB) is a contagious infection that spreads through the air when someone with the infection coughs, sings, or speaks and other people inhale it. Some people have latent TB and do not have any symptoms, though they can still spread the infection.
People with weakened immune systems are particularly at risk for developing TB. The infections are treatable, but if left untreated, they can progress to TB disease, which causes significant lung damage and can be fatal.

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