USMLE

Staph saprophyticus

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Bacteria - Gram Positive
  1. Staph aureus: Overview
  2. Staph aureus: Presentation
  3. Methicillin-Resistant Staph aureus (MRSA)
  4. Staph saprophyticus
  5. Strep pneumoniae: Overview
  6. Strep pneumoniae: Presentation
  7. Strep viridans
  8. Strep pyogenes: Overview
  9. Strep pyogenes: Presentation
  10. Strep agalactiae
  11. Strep bovis
  12. Enterococcus
  13. Bacillus anthracis
  14. Bacillus cereus
  15. Clostridium tetani
  16. Clostridium perfringens
  17. Clostridium botulinum
  18. Clostridium difficile
  19. Corynebacterium diphtheriae
  20. Listeria monocytogenes
  21. Nocardia
  22. Actinomyces
  • Staphylococcus saprophyticus 
    • Gram + cocci in clusters 
    • Catalase +
      • First test to differentiate staph vs. strep (catalase negative)
    • Coagulase –
      • Second test to differentiate from staph aureus (coagulase positive)
    • Novobiocin resistant
      • Third test to differentiate vs. staph epidermidis (novobiocin-sensitive), by exposure to the antibiotic novobiocin
    • Urease positive
      • Found to be a virulence factor in the development of UTIs
      • Cleavage of urea into ammonia and carbon dioxide may produce an environment more friendly to growth
    • Normal flora of female genital tract and perineum
    • Causes UTls in sexually active women
      • Second most common cause, after E. coli
      • Presents with dysuria, urinary frequency/urgency, suprapubic pain
      • Microorganisms adhere to uroepithelial cells
    • Treatment
      • Trimethoprim-sulfamethoxazole
      • Nitrofurantoin