Major Bacterial Genera

  1. Gram positive cocci include what 3 major genera?
    • Staphylococci - grows in grape-like clusters
    • Streptococci - grows in pairs or chains
    • Enterococci - grows in pairs or chains
  2. What does the catalase test differentiate?
    • + reaction: Staphylococci
    • - reaction: Streptococci or Enterococci
  3. What does coagulase testing differentiate?
    • + reaction: Staphylococcus aureus
    • - reaction: all other Staphylococci, which are normal flora; only S. saprophyticus and epidermidis are pathogenic
  4. ID the bug:
    - Gram-pos cocci in grape-like clusters
    - Catalase and coagulase positive
    - Beta-hemolytic
    - Grows yellow colonies on mannitol-salt agar
    Staphylococcus aureus
  5. ID the bug:
    Gram-pos cocci in pairs/chains
    Catalase negative
    Alpha-hemolytic
    Infects bloodstream and CNS
    • Streptococcus pneumoniae, aka Viridans Strep
    • Most common alpha-hemolytic Streptococcus
  6. ID the bug:
    Gram-pos cocci in pairs/chains
    Catalase negative
    Beta-hemolytic
    Causative agent of many URIs and strep throat
    Streptococcus pyogenes
  7. ID the bug:
    Gram-pos cocci in pairs/chains
    Catalase negative
    Gamma-hemolytic
    Group D Lancefield Streptococci
  8. ID the bug:
    Gram-pos cocci in pairs/chains
    Lancefield Group D antigen positive
    Resistant to bile salts
    Normal GI flora
    Enterococcus species
  9. Gram positive rods can be divided based on what two criteria?
    • Spore-forming vs non-spore forming
    • Aerobic vs Anaerobic
  10. ID the bug, and where they can be found:
    Gram-pos rod
    Spore-forming
    Aerobic
    • Bacillus
    • Found in soil and waterImage Upload 1
  11. ID the bug, and where they can be found:
    Gram-pos rod
    Spore-forming
    Anaerobic
    • Clostridium
    • Found in soil, water, and human GI tractImage Upload 2
  12. ID the bug:
    Gram-positive rod (sometimes club-shaped)
    Non-spore forming
    Aerobic
    Normal flora except one
    • Corynebacterium
    • Normal flora, except C. diptheriae
    • Image Upload 3
  13. ID the bug:
    Gram-pos rod
    Non-spore forming
    Aerobic
    Normal flora of mouth, vagina, and GI
    LactobacillusImage Upload 4
  14. ID the bug:
    Gram-pos rod
    Non-spore forming
    Aerobic
    Can grow as low as 4*C
    Facultative intracellular
    Exhibits tumbling motility
    ListeriaImage Upload 5
  15. ID the bug:
    Gram-positive rod
    - filamentous and branching
    - can also stain partial acid-fast
    Non-spore forming
    Aerobic
    Found in soil and water
    Opportunistic
    NocardiaImage Upload 6
  16. ID the bug:
    Gram-pos rod
    - filamentous and branching
    Normal flora
    Anaerobic
    ActinomycesImage Upload 7
  17. ID the bug:
    Gram-neg cocci
    Grown on chocolate agar in 5% CO2
    Colonize mucosal surfaces
    - associated with or in PMNs
    Oxidase positive
    • Neisseria spp
    • mostly non-pathogenic
    • two pathogenic species are N. gonorrhoeae and N. meningitidis
  18. How can you differentiate between N. meningitidis and N. gonorrhoeae?
    • By the sugars they ferment:
    • N. gonorrhoeae only ferments glucose
    • N. meningitides ferments maltose and glucose
  19. ID the bug:
    Gram-neg coccobacilli (actually bacillus)
    Found in water and soil
    Can colonize skin
    Antibiotic resistant
    Important nosocomial pathogen
    Acinetobacter
  20. ID the bug:
    Gram-neg coccobacilli (actually bacillus)
    Normal upper respiratory flora
    Cause of otitis media, bacteremia, meningitis, among others
    Moraxella
Author
Anonymous
ID
105520
Card Set
Major Bacterial Genera
Description
The major bacterial genera broken down by diagnostic tools, such as Gram staining, cell structure, and metabolic ability. Also includes some prefix and suffix definitions.
Updated