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A group of bacteria which live within the bowels of larger organisms and ferment a sugar called lactose, producing gas within 48 hours of growth. They are generally small, gram-negative, bacilliform (shaped like rods), facultative anaerobes and they include strains such as Escherichia, Kelbsiella, Enterobacter, and Citrobacter. They are useful for measuring the amount of water pollution by feces.

Selected coliforms links:

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