DR LINDA STANNARD, UCT / SCIENCE PHOTO LIBRARY DR LINDA STANNARD, UCT / SCIENCE PHOTO LIBRARY
Tuberculosis bacteria. Coloured transmission electron micrograph (TEM) of a section through Mycobacterium tuberculosis bacteria. These Gram- positive rod-shaped bacteria are the main cause of human tuberculosis. If a bacterium enters the lungs in a droplet coughed or sneezed by an infected person, it multiplies to form a localized bacterial colony (primary tubercle). Normally the immune system destroys the tubercle. Sometimes, however, the bacteria then either spread to other parts of the body, which can be fatal, or lie dormant, only becoming active again several years later. Magnification unknown.
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