Gram positive: Most streptococci, Streptococcus pneumoniae, Streptococcus anginosus group, Enterococcus faecalis, Listeria monocytogenes, Staph aureus (MSSA)

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

Anaerobic: Actinomyces, Prevotella , non-difficile Clostridia, Peptostreptococci, Bacteroides