Citrobacter koserii (Citrobacter diversus)

An aerobic gram-negative bacillus that grows readily on most microbiological media producing a smooth colony. It is part of the normal intestinal flora of humans and animals and is isolated from soil, water, sewage, and food. It is an opportunistic pathogen for humans causing both diarrhea and extra intestinal infections (meningitis, abscesses, and septicemia).

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