title: Quality control guidelines for testing gram-negative control strains with polymyxin B and colistin (polymyxin E) by standardized methods.
abstract: An eight-laboratory study addressed the urgent need for quality control (QC) ranges for susceptibility determination when testing colistin (polymyxin E) and polymyxin B, two polycationic peptide antimicrobial agents, against multidrug-resistant gram-negative bacilli. For Escherichia coli ATCC 25922l, the QC ranges were as follows: for colistin, 0.25 to 1 microg/ml (11 to 17 mm), and for polymyxin B, 0.25 to 2 microg/ml (13 to 19 mm). For Pseudomonas aeruginosa ATCC 27853, the QC ranges were as follows: for colistin, 0.25 to 2 microg/ml (11 to 17 mm), and for polymyxin B, 0.25 to 2 mug/ml (14 to 18 mm). More than 97% of all reported QC results were within these proposed ranges.
authors.affiliation: The JONES Group/JMI Laboratories, Inc., 345 Beaver Kreek Centre, Suite A, North Liberty, IA 52317, USA. ronald-jones@jmilabs.com
authors.forename: Ronald N
authors.initials: RN
authors.lastname: Jones
authors.forename: Tamara R
authors.initials: TR
authors.lastname: Anderegg
authors.forename: Jana M
authors.initials: JM
authors.lastname: Swenson
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D003091:Colistin / Q000494:pharmacology*; D024901:Drug Resistance, Multiple, Bacterial; D004926:Escherichia coli / Q000187:drug effects*; D006801:Humans; D007753:Laboratories / Q000592:standards*; D008826:Microbial Sensitivity Tests / Q000379:methods / Q000592:standards; D011112:Polymyxin B / Q000494:pharmacology*; D011550:Pseudomonas aeruginosa / Q000187:drug effects*; D011786:Quality Control; D012015:Reference Standards
chemical_list: D000900:Anti-Bacterial Agents; D011112:Polymyxin B; D003091:Colistin