Gram positive: Streptococci group A/B/C/G, Streptococcus pneumoniae, Streptococcus anginosus group, Enterococcus faecalis, Listeria monocytogenes

Gram negative: Neiserria meningitidis, Pasturella multocida

Anaerobic: Actinomyces, Prevotella melaninogenica, Clostridia, Peptostreptococci