Table 1.

Colistin activity spectrum on Gram-negative bacteria.

Sensitive	Resistance	Variables
Escherichia coli * Klebsiella pneumoniae * Pseudomonas aeruginosa * Acinetobacter baumannii * Salmonella spp. Shigella spp. Legionella pneumophila Haemophilus influenzae Bordetella pertussis Prevotella spp.a Fusobacterium spp.a	Proteus spp. Burkholderia spp. Helicobacter pylori Neisseria meningitidis Bacteroides fragilis a	Stenotrophomonas maltophilia Moraxella catarrhalis Vibrio spp. Aeromonas spp.

* Sensitive Gram-negative bacilli with reported colistin resistance. ^a Strict anaerobic bacteria. Modified from the literature [6].