ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Mycobacterium tuberculosis. Transmission electron micrograph (TEM) of Mycobacterium tuberculosis bacteria. It is a rod-shaped bacillus that causes tuberculosis (TB) in humans. Here, the thick cell wall is seen (red contour) made of protein and lipids. Mycobacterium tuberculosis is spread by coughing or sneezing, and is inhaled into the lungs. It forms a primary tubercle during initial infection, which develops into pulmonary TB. TB is still a fatal disease in developing countries and among AIDS patients. Magnification: x50,000 at 6x6cm size.
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