Gram positive bacteria

• Streptococcus pneumoniae

• Beta-hemolytic Streptococcus spp.

• Streptococcus anginosus group

• Enterococcus faecalis

• Listeria monocytogenes

Gram negative bacteria

• Neiserria meningitidis

• Pasteurella multocida

Anaerobes

• Actinomyces spp.

• Clostridium spp.

• Peptostreptococcus spp.

• Propionibacterium acnes