ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Mycobacterium tuberculosis. Coloured Transmission Electron Micrograph (TEM) of a cross-section through Mycobacterium tuberculosis bacteria. Two pairs of recently divided, rod-shaped bacillus bacteria are seen. The outer cell wall is coloured green; DNA genetic material appears yellow within the cell contents. Mycobacterium tuberculosis is the cause of tuberculosis (TB) in humans. The bacteria are spread by coughing or sneezing, and are inhaled into the lungs. A primary tubercle (lesion) forms during initial infection, which develops into pulmonary TB. TB is still a fatal disease in developing countries and among AIDS patients. Magnification: x6,000 at 6x4.5 cm size.
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