Gram positive

•  Staphylococci including many MRSA

•  S. pneumoniae

Gram negative

•  M. catarrhalis

•  H. influenzae

•  Brucella

Anaerobic

•  Actinomyces

•  Prevotella

•  Non- difficile Clostridia

•  Peptostreptococci

Other

•  Atypicals including Mycoplasma, Chlamydophila

•  Rickettsia

•  Borrelia

•  Some Mycobacteria