Public Domain Picture: Under a magnification of 6836x, this colorized scanning electron micrograph (SEM) depicted two Gram-negative Escherichia coli bacteria of th

By: CDC/ National Escherichia, Shigella, Vibrio Reference Unit at CDC, Courtesy: Public Health Image Library

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Under a magnification of 6836x, this colorized scanning electron micrograph (SEM) depicted two Gram-negative Escherichia coli bacteria of th

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Under a magnification of 6836x, this colorized scanning electron micrograph (SEM) depicted two Gram-negative Escherichia coli bacteria of th

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Under a magnification of 6836x, this colorized scanning electron micrograph (SEM) depicted two Gram-negative Escherichia coli bacteria of the strain O157:H7. E. coli O157:H7 is one of hundreds of strains of this bacterium. Although most strains are harmless, and live in the intestines of healthy humans and animals, this strain produces a powerful toxin, which can cause severe illness.E. coli O157:H7 was first recognized as a cause of illness in 1982 during an outbreak of severe bloody diarrhea; the outbreak was traced to contaminated hamburgers. Since then, most infections have come from eating undercooked ground beef.The combination of letters and numbers in the name of the bacterium refers to the specific markers found on its surface, which distinguishes it from other types of E. coli. See PHIL 8799 for a black and white version of this image.

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CDC/ National Escherichia, Shigella, Vibrio Reference Unit at CDC

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Public Health Image Library

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