Enrofloxacin is effective against a broad spectrum of gram-positive and gram-negative bacteria including most species of the following: Pseudomonas aeruginosa, Klebsiella, E.coli., Enterobacter, Campylobacter, Shigella, Salmonella, Aeromonas, Haemophillus, Proteus, Yersinia, Serratia, Vibrio, Brucella, Chlamydia, Staphylocci (including some methicillinresistant strains), Mycobacterium.