Gram positive:

• Staphylococci

Gram negative:

• M. catarrhalis

• H. influenzae

• Brucella

• Bartonella

• Vibrio

Anaerobic:

• Actinomyces

• Prevotella

• Non-difficile Clostridia

• Peptostreptococci

Other:

• Atypicals (incl. Mycoplasma and Chlamydophila)

• Rickettsia

• Borrelia

• Some mycobacteria