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首页> 外文期刊>Journal of Clinical Microbiology >Use of Fosfomycin Etest To Determine In Vitro Susceptibility of Clinical Isolates of Enterobacterales Other than Escherichia coli, Nonfermenting Gram-Negative Bacilli, and Gram-Positive Cocci
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Use of Fosfomycin Etest To Determine In Vitro Susceptibility of Clinical Isolates of Enterobacterales Other than Escherichia coli, Nonfermenting Gram-Negative Bacilli, and Gram-Positive Cocci

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Clinical isolates of Enterobacterales other than Escherichia coli (EOTEC), non-fermenting Gram-negative bacilli, and Gram-positive cocci were tested for susceptibility to fosfomycin using Etest and reference agar dilution. Applying EUCAST (v. 11.0, 2021) intravenous fosfomycin breakpoints, Etest MICs for EOTEC showed essential agreement (EA), categorical agreement (CA), major error (ME), and very major error (VME) rates of 70.4, 88.4, 4.1, and 32.1, respectively. No species of EOTEC tested with acceptable rates for all of EA ($90), CA ($90), ME (#3), and VME (#3). Etest MICs for Enterococcus faecalis, interpreted using CLSI oral/urine criteria (M100, 2021) showed EA, CA, minor error, ME, and VME rates of 98.5, 81.2, 18.8, 0, and 0. Against Staphylococcus aureus, EA, CA, and ME rates were 84.1, 98.7, and 1.3 (EUCAST intravenous criteria). S. aureus isolates with fosfomycin MICs of.32 mg/ml (resistant) were not identified by agar dilution. We conclude that performing fosfomycin Etest on isolates of S. aureus will reliably identify fosfomycin-susceptible isolates with low, acceptable rates of MEs and VMEs. Testing of urinary isolates of E. faecalis by Etest is associated with an unacceptably high rate of minor errors (18.8) but low, acceptable rates of MEs and VMEs when results are interpreted using CLSI criteria. Isolates of EOTEC tested by Etest with resulting MICs interpreted by EUCAST criteria were associated with an unacceptably high VME rate (32.1). In vitro testing of clinical isolates beyond E. coli, E. faecalis, and S. aureus to determine susceptibility to fosfomycin is problematic with current methods and breakpoints.

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