Source

Most commonly cultured organisms

Paranasal sinus infection

Streptococcus spp.

Staphylococcus spp.

Enterobacteriaceae (especially

Hemophilus spp., Pseudomonas aeruginosa)

Otogenic infection

Proteus mirabilis

Streptococcus milleri group organisms

Streptococcus pneumoniae

Staphylococcus aureus

Dental infection

Streptococcus spp.

Bacteroides fragilis

Traumatic brain injury

Staphylococcus aureus

Staphylococcus epidermidis

Enterobacteriaceae (most commonly P. aeruginosa, Enterobacter spp.)

Neurosurgical procedure

Staphylococcus aureus

Staphylococcus epidermidis

Pseudomonas aeruginosa

Propionibacterium acnes

Streptococcus spp.

Hematogenous spread

Staphylococcus aureus

Streptococcus viridans

Klebsiella pneumoniae