Escherichia.coli is a Gram-negative, rod-shaped, facultative anaerobic bacteria. The species of Escherichia coli are inhabitants of the human intestinal tracts. It plays a nutritional role by generating vitamins, mainly vitamin K. Most of the strains of E.coli are harmless, while the others cause abdominal cramps, vomiting, fever, dehydration, bloody diarrhea, and even kidney failure. It is a mixed-acid fermenter.
Klebsiella is a Gram-negative, nonmotile, rod-shaped, oxidase-negative bacteria. It causes hospital-acquired urinary tract infections, pneumonia, septicemia, and soft tissue infections. It is a butanediol fermenter.
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