Common Bacterial Pathogens for Select Sites of Infection

CNS/Meningitis

Streptococcus pneumoniae

Neisseria meningitidis

Haemophilus influenzae

Group B Streptococcus/E.Coli (young)

Listeria (young/old)

Mouth

Mouth flora (peptostreptococcus)

Anaerobic GNR (prevotella, others)

Viridans group streptococci

Upper Respiratory

Streptococcus pyogenes

Streptococcus pneumoniae

Haemophilus influenzae

Moraxella catarrhalis

Lower Respiratory (Community)

Streptococcus pneumoniae

Haemophilus influenzae

Atypicals: Legionella, Mycoplasma, Chlamydophila

Enteric GNR (alcohol use disorder)

Heart/Endocarditis

Staphyloccus aureus, including MRSA

Staphyloccocus epidermidis

Streptococci

Enterococci

Lower Respiratory (Hospital)

Staphylococcus aureus, including MRSA

Pseudomonas aeruginosa

Acinetobacter Baumannii

Enteric GNR (including ESBL+, MDR)

Streptococcus pneumoniae

Skin/Soft Tissue

Staphylococcus aureus

Staphylococcus epidermidis

Streptococcus pyogenes

Pasteurella multocida ± aerobic/anaerobic GNR (in diabetes)

Bone/Joint

Staphyloccus aureus

Staphylococcus epidermidis

Streptococci

Neisseria gonorrhoeae

GNR (in specific situations)

Urinary Tract

E. Coli

Proteus

Klebsiella

Staphylococcus saprophyticus

Enterococci

Intra-Adominal

Enteric GNR

Enterococci

Streptococci

Bacteroides species

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