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Proteus sp. bacteria. Coloured scanning electron micrograph (SEM) of Proteus sp. bacteria. The Gram-negative, rod-shaped bacteria in this group are commonly found in the soil and in inland lakes and rivers, and often form part of the normal intestinal flora in humans. However, some species are opportunistic pathogens in hospitals, causing urinary tract infections and pneumonia in patients. Magnification: x2, 500 at 6x6cm size.
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