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Tuberculosis. Light micrograph of a section through lung tissue showing a follicle (rounded pink area) caused by miliary tuberculosis (TB). TB is a disease caused by the inhalation of Mycobacterium tuberculosis bacteria. In miliary tuberculosis, the bacteria have spread into the blood, and can be carried to other sites in the body. TB causes coughing (often with bloody sputum), chest pain, shortness of breath and fever. It may be fatal. It can be treated with antibiotic drugs, although they may have to be taken for several months. A vaccine (BCG) is also available, which confers lifelong protection against the disease. Magnification unknown.
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