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Tuberculosis (TB) is a chronic infection caused by the bacterium tuberculosis (TB).Tuberculous bacterium invades human body all sorts of organs possibly, but basically encroach lung, call tuberculosis disease. Tuberculosis (TB) is a chronic and slow - onset infectious disease in young people.The incubation period is 4 to 8 weeks.Of these, 80% occur in the lungs, and other areas (cervical lymph, meninges, peritoneum, intestine, skin, bone) may also be secondary to infection.Transmission of respiratory tract from person to person is the main mode of transmission.Infection source is the person that contacts the tuberculosis that discharges bacterium.With the spread of environmental pollution and AIDS, the incidence of TB is becoming more and more intense.In addition to a few cases of rapid onset, clinical more chronic process.There are often low fever, fatigue and other systemic symptoms and respiratory symptoms such as cough, hemoptysis.
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