Gram positive:

• Most Streptococci

• Enterococcus faecalis

• Staph aureus (MSSA)

Gram negative:

• Many Enterobacteriaceae

• Neisseria spp.

• Haemophilus

• Moraxella

• Pasteurella

Anaerobes:

• Bacteroides fragilis

• Prevotella

• Non-difficile Clostridia

• Peptostreptococci

• Actinomyces