E. coli: Understanding Types, Risks, and Health Impacts

Escherichia coli (E. coli) is a Gram-negative rod-shaped bacterium.

1. Commonly found in warm-blooded animal guts (including humans).
2. Most strains are harmless/beneficial (aid digestion, produce vitamins).
3. Pathogenic strains cause food poisoning, UTIs, other illnesses.
4. E. coli O157:H7 produces Shiga toxin → severe abdominal pain, bloody diarrhea, dehydration.
5. Transmission: contaminated food/water, contact with infected animals/people.
6. Prevention: thorough cooking, handwashing, avoiding contaminated water.
7. Treatment: supportive care; antibiotics for severe cases.
8. Model organism in research: molecular biology, genetics, pathogenesis.
9. Versatile, adapted to diverse environments.