Proposed Epidemiological Cutoff Values for Ceftriaxone, Cefepime, and Colistin in Salmonella

Foodborne Pathogens and Disease
Gregory H TysonRon A Miller

Abstract

We tested a diverse set of 500 isolates of nontyphoidal Salmonella enterica subsp. enterica from various animal, food, and human clinical sources for susceptibility to antimicrobials currently lacking epidemiological cutoff values (ECOFFs) set by the European Committee on Antimicrobial Susceptibility Testing. A consortium of five different laboratories each tested 100 isolates, using broth microdilution panels containing twofold dilutions of ceftriaxone, cefepime, and colistin to determine the minimum inhibitory concentrations of each drug when tested against the Salmonella isolates. Based on the resulting data, new ECOFFs of 0.25 μg/mL for ceftriaxone, 0.12 μg/mL for cefepime, and 2 μg/mL for colistin have been proposed. These thresholds will aid in the identification of Salmonella that have phenotypically detectable resistance mechanisms to these important antimicrobials.

References

Apr 29, 2006·Clinical Microbiology and Infection : the Official Publication of the European Society of Clinical Microbiology and Infectious Diseases·J TurnidgeG Kronvall
Feb 4, 2012·Foodborne Pathogens and Disease·Yvonne AgersøEva Møller Nielsen
Jun 14, 2013·Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America·Pranita D TammaKaren C Carroll

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Citations

Jun 10, 2020·Antimicrobial Agents and Chemotherapy·Gregory H TysonShaohua Zhao

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Software Mentioned

Normalized Resistance Interpretation ( NRI )
ECOFFinder

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