Common Bacterial Pathogens for Select Sites of Infection

CNS/Meningitis

1. S. pneumoniae

2. N. meningitidis

3. H. influenzae

4. Group B Strep/E. coli (effects younger people)

5. Listeria (effects younger and older people)

Mouth

1. Mouth flora (Peptostreptococcus, Atinomyces)

2. Anaerobic Gram negative rods (Provatella, others)

3. Viridans group Streptococci

Upper respiratory

1. S. pyogenese

2. S. pneumoniae

3. H. influenzae

4. M. catarrhalis

Lower respiratory (community)

1. S. pneumoniae

2. H. influenzae

3. Atypicals (Legionella, mycoplasma)

4. Enteric gram-negative rods (Proteus, E. coli, Klebsiella, Enterobacter) in alcoholics and immunocompromised

Lower respiratory (hospital)

1. S. aureus (including MRSA)

2. P. aeruginosa

3. Enteric gram-negative rods

4. S. pneumoniae

Heart

1. S. aureus (including MRSA)

2. S. epidermidis

3. Streptococci

4. Enterococci

Intra-abdominal

1. Enteric gram-negative rods

2. Enterococci/streptococci

3. Bacterioides species

Skin/Soft tissue

1. S. aureus

2. S. pyogenes

3. S. epidermidis

4. P. multocida +/- aerobic/anaerobic gram-negative rods (in diabetics)

Urinary tract

1. E. coli

2. Proteus

3. Klebsiella

4. S. saprophyticus

5. Streptococci/enterococci

Bone and joint

1. S. aureus

2. S. epidermidis

3. Streptococci

4. Neisseria gonorrhoeae

5. GNR (only in specific situations

S. pneumoniae

H. flu

1. CNS/Meningitis

2. U/L Respiratory

Group B Strep