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What organisms cause meningitis?

  • Neisseria meningitidis

  • Haemophilus influenza

  • Listeria monocytogenes

  • Streptococcus agalactiae

  • Streptococcus pneumoniae

What 3 genera and 1 species cause urinary tract infections?
  • E. coli
  • Enterobacter spp.
  • Proteus spp.
  • Enterococci
What causes gas gangrene?
C. perfringens
What causes botulism?
C. botulinum
What causes tetanus?
C. tetani
What organism is associated with IUD-related infections?
Actinomyces israeli
What 2 infections are associated with IV catheters?
  • CNS (S. epidermis)
  • C. jeikeium
What organism is responsible for strep throat?
GAS (Group A Strep) = S. pyogenes
What are the gram-positive genera (7)?
  • Staphylococcus spp
  • Streptococcus spp
  • Peptostreptococcus spp
  • Corynebacterium spp
  • Listeria spp
  • Actinomyces spp
  • Clostridium spp
What are the gram-negative genera (11 genera, 1 species)?

Enterobacteriaceae

  • E. coli

  • Enterobacter spp

  • Salmonella spp

  • Proteus spp



Other genera


  • Vibro spp

  • Moraxella spp

  • Pseudomonas spp

  • Haemophilus spp

  • Neisseria spp

  • Bacteroides spp

  • Helicobacter spp

  • Rickettsia spp

What are the non-gram staining (including special staining bacteria)?
Non-gram stain
  • Treponema pallidum
  • Mycoplasma spp
  • Chlamydia/chlamydophilia spp (Intracellular)
Special stain
  • Mycobacterium spp (Ziehl-Neelson)
What causes community-acquired pneumonia (2)?
  • Streptococcus pneumoniae
  • Moraxella catarrhalis
What causes cystic fibrosis pneumonia (2)?
  • Pseudomonas aeruginosa
  • Staphylococcus aureus
What causes pneumonia in general (1)?
  • Haemophilus influenza
What causes ventilator-acquired pneumonia (1)?
  • Pseudomonas aeruginosa
What causes aspiration pneumonia (1)?
  • Bacteroides pneumoniae
What causes atypical pneumonia (2)?
  • Mycoplasma pneumoniae
  • Chlamydophilia psittaci
What are the Enterobacteriaceae?
  • E. coli
  • Salmonella
  • Proteus
  • Enterobacter
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