Gram positive: Most streptococci, Streptococcus pneumoniae, Streptococcus anginosus group, Enterococcus faecalis, Listeria monocytogenes

Gram negative: Pasturella multocida, E.Coli, H.influenza

Anaerobic: Actinomyces, Prevotella melaninogenica, Peptostreptococci