KWANGSHIN KIM / SCIENCE PHOTO LIBRARY KWANGSHIN KIM / SCIENCE PHOTO LIBRARY
Tuberculosis bacteria. Coloured transmission electron micrograph (TEM) of sectioned Mycobacterium tuberculosis bacteria, the cause of tuberculosis (TB) in humans. These Gram-positive, rod-shaped bacteria are spread by coughing or sneezing and inhaled into the lungs. There, they multiply to form a primary tubercle, a localized colony of bacteria. The bacteria may spread through the lymphatic system to other parts of the body, which can be fatal, or they may lie dormant, becoming active again many years later. Infections can be treated with antibiotics. Magnification: x4900 at 6x8.5cm size.
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