Gram-positive

• Unreliable against Staphylococci, Bacillus anthracis

Gram-negative

• Pseudomonas
• Enterobacteriaceae
• Neisseria
• Haemophilus
• Moraxella
• Pasteurella

Anaerobes

• Not reliable

Other

• Atypicals including Legionella

Does not cover

• Most gram positives
• Streptococci
• Enterococci
• Stenotrophomonas
• Anaerobes