Gram positive

• No Gram positive aerobes

Gram negative

• No Gram negative aerobes

Anaerobic

• Most including:

  • Bacteroides fragilis
  • Clostridia including C. difficile

• Excluding:

  • Propionibacterium acnes

Other

• H. pylori

• Anaerobic protazoa - Entamoeba

• Giardia

• Trichomonas