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A rapid test was developed for identification of polymyxin resistance in non-fermenting bacteria. This test detects viable cells after growth in a medium containing a defined concentration of colistin. The principle of this test is based on the visual detection of the reduction of the resazurin reagent, a viability colorant, observed by its color change (blue to purple or pink). Its evaluation was performed by using 92 colistin- resistant and colistin-susceptible Acinetobacter baumannii and Pseudomonas aeruginosa isolates. Sensitivity and specificity were respectively found to be 100 and 95% by comparison with the standard broth microdilution method. The Rapid ResaPolymyxin Acinetobacter/Pseudomonas NP test is inexpensive, easy-to-perform, highly sensitive and specific, and can be completed in 4 hours. It could be useful in countries facing endemic spread of colistin-resistant non fermenters. |
