SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Listeria monocytogenes bacteria. Coloured scanning electron micrograph (SEM) of Listeria monocytogenes bacteria, the causative agent of the human disease listeriosis. These Gram-positive rod- shaped bacteria have a thick cell wall covered by a fibrous capsular material. Listeriosis is contracted through contaminated food. Those vulnerable include pregnant women, in which the baby may be infected; the elderly; cancer patients and those on immunosuppressant drugs. These bacteria may also be a cause of encephalitis and purulent meningitis. Magnification unknown.
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