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