Gram positive

•  Unreliable against Staphylococci

•  Bacillus anthracis

Gram negative

•  Pseudomonas

•  Enterobacteriaceae

•  Neisseria meningitis

•  Haemophilus

•  Moraxella

•  Pasteurella

Other

•  Atypicals including Legionella

• Mycoplasma

• Chlamydophila

Does not cover

• Most gram positives including Streptococci, Stenotrophomonas, anaerobes