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26.9 MB (1.7 MB compressed)
2655 x 3543 pixels
22.4 x 30.0 cm ⏐ 8.8 x 11.8 in (300dpi)
DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY
Listeria monocytogenes. Coloured transmission electron micrograph of the bacteria Listeria monocytogenes, causative agent of "listeriosis" in humans. These Gram-positive, soil saprophytic bacteria have a thick cell wall (brown), with capsular material seen adhering. It is contracted through contaminated food. Pregnant women are especially vulnerable; bacteria may cross the placenta to infect the baby which has no immunity. The elderly, cancer patients and those on immunosuppressive drugs are also vulnerable. These bacteria may be a cause of encephalitis & purulent meningitis. Magnification: x83,000 at 6x4.5cm size.
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