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 including Streptococci, Enterococci; Stenotrophomonas, anaerobes