Common Pathogenic Organisms

Question 1

Skin & Soft Tissue

Answer 1

GP:
- Cocci: S. aureus, S. epidermidis, Strep pyogenes
- Rods: Clostridium spp. (not C.diff)

Question 2

Bone & Joint

Answer 2

GP:
- Cocci: S. aureus, S. epidermidis, S. pyogenes, Enterococcus
- Rods: Clostridium spp. (Not C.diff)
GN:
- Cocci: Neisseria gonorrhoeae
- Rods: Pseudomonas, Enterobacterales, H.influenzae, Bacteroides fragilis

Question 3

CNS

Answer 3

GP:
- Cocci: Strep agalactiae, Strep pneumoniae
- Rods: Listeria monocytogenes
GN:
- Cocci: Neisseria meningitidis
- Rods: H. influenza

Question 4

Oral Cavity

Answer 4

GP:
- Cocci: Peptostreptococcus
- Rods: Actinomyces
GN:
- Rods: Bacteroides (non-fragilis)

Question 5

Upper Respiratory Tract

Answer 5

GP:
- Cocci: S. pneumoniae, S. pyogenes
GN:
- Cocci: Moraxella catarrhalis
- Rods: H. influenzae

Question 6

Lower Respiratory Tract

Answer 6

GP:
- Cocci: S. pneumoniae
GN:
- Cocci: M. catarrhalis
- Rods: H. influenzae, K. pneumoniae
Other: L. pneumophilia, M.pneumoniae, C. pneumoniae

Question 7

Abdomen

Answer 7

GP:
- Cocci: Enterococcus
- Rods: Clostridium
GN:
- Rods: E.coli, Klebsiella, Proteus, Bacteroides (including B.fragilis)

Question 8

Urinary Tract

Answer 8

GP:
- Cocci: Staph saprophyticus, Enterococcus
GN:
- Rods: E.coli, Klebsiella, Proteus mirabilis
Other: Candida