DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of Salmonella typhimurium, Gram-negative, enteric, DT104, rod prokaryote (dividing); note the flagella. In humans it is know to cause severe gastritis. When the bacterial cells enter epithelial cells lining the intestine they cause host cell ruffling which temporarily damages the microvilli on the surface of the cell. This affects the ratios between absorption and secretion, and leads to diarrhoea. Magnification: x2,600 when shortest axis printed at 25 millimetres.
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