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Tuberculosis bacteria. Immunofluorescent light micrograph of tuberculosis bacteria (Mycobacterium tuberculosis, yellow). These bacteria are the main cause of tuberculosis (TB) in humans. TB is spread by the inhalation of droplets coughed or sneezed by an infected person. The bacteria multiply and form a localized tuberculosis bacterial colony (tubercle) in the lungs. Untreated infections can spread to other parts of the body, and can be fatal. Infection is treated with antibiotics. The BCG vaccine, given in childhood, can confer lifelong protection. Immunofluorescence staining uses antibodies to attach fluorescent dye to cells and tissues. Magnification: x500 at 35mm size.
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