Add time:07/28/2019         Source:sciencedirect.com

In 2017, the Clinical and Laboratory Standards Institute (CLSI) Subcommittee on Antimicrobial Susceptibility Testing approved the use of iron-depleted cation-adjusted Mueller-Hinton broth (ID-CAMHB) prepared with Chelex® 100 resin (Bio-Rad Laboratories, Hercules, CA) to determine MICs for cefiderocol. The current study examined the reproducibility of cefiderocol MICs generated for 19 clinical isolates of Gram-negative bacilli, with CAMHB produced by three manufacturers; each of the 19 isolates was tested for 10 replicates in ID-CAMHB from each manufacturer. When analyzed by individual media lot, greater than 95% of MIC results were within ± one doubling-dilution of the mode for each of the 19 isolates tested. The remaining 5.0% of MIC results were within ± two doubling-dilutions of the modal MIC. For all media lots combined, 92.2% of MIC results were within ± one doubling-dilution of the modal MIC for each isolate, 99.8% were within ± two doubling-dilutions and 100% were within three doubling-dilutions.

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