Pseudomonas aeruginosa

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Pseudomonas aeruginosa /
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Pseudomonas aeruginosa

Microbiology

  • Oxidase-positive, non-fermenting Gram negative bacillus

Mechanisms of Resistance

  • Broad intrinsic and acquired antibiotic resistance
  • Membrane impermeability
  • MexAB-OprM efflux pump
  • Acquired mutations
  • Inducible AmpC β-lactamase
  • Plasmid sharing

Environment and Infections

  • Loves moist and wet environments
  • Causes healthcare-associated infections
    • UTI, SSI, bacteremia, HAP, VAP
    • Especially common in cystic fibrosis

Treatment

  • See [Antipseudomonal antibiotics](/Infectious Diseases/Basics/Antimicrobials/Antipseudomonal antibiotics.md)
  • Double coverage (ß-lactam + non-ß-lactam) in cases of severe infection in order to ensure activity against the infection