215 Ch 20 coli salm shig- FINAL

215 Ch 20 coli salm shig- FINAL - Ch.20 GramNeg....

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Ch. 20:   Gram Neg. Bacilli of Medical Importance Enteric Bacilli: (E. coli, Salmonella, Shigella, Enterobacter, Yersinia, Klebsiella, Citrobacter, Proteus, etc.) Coliform bacteria:   Common enteric flora  (opportunists) Indicate fecal contamination Diagnosis/Identification:  (Fig 20.10) Share many properties including morphology Require battery of biochemical tests
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Escherichia coli:
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General Characteristics: Small, non-sporeforming rods Facultative aerobes flagellated Contains endotoxin (LPS) Gram neg. septicemia (read insight 20.1) Nosocomial/surgical problem  Freely transfers genes Conjugation Escherichia coli:
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Escherichia coli: Reservoir/Transmission: - Common in Human intestine >150 strains Range from harmless to highly  infectious  (some true pathogens) Translocation into other organs - Common environmental/hospital  contaminant Common in soil, bodies of water Survive in soap dishes, sinks Catheters
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Epidemiology:   - Most frequent cause of infectious diarrheal  illness  - 4 billion infections, 3 million deaths annually Escherichia coli:
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Prevalent strains of E. coli:
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