Colour enhanced scanning electron micrograph of Escherichia coli (E. coli). E. coli are present in the intestinal contents of animals and are thus also called the intestinal rods. They are used as indicators of contamination with faecal material. In the past, some of these originally harmless bacteria developed toxins and became a serious health hazard to humans and animals. Magnification 12,000x at 5x7(inches).
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