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Tuberculosis is a bacterial infection that affects the lungs. The bacteria that causes TB are spread when an infected person coughs or sneezes. Active TB is curable if you are treated with antibiotics to kill all of the germs. Treatment for TB usually takes six to nine months. Some symptoms of TB include, a cough that lasts longer than 3 weeks, loss of appetite and unintentional weight loss, fever, child, and night sweats. If left untreated, TB can become fatal.