Evaluation of BD Phoenix and Microscan WalkAway for determination of fosfomycin susceptibility in Staphylococcus aureus

We evaluate the performance of BD Phoenix (BD Diagnostic; Hunt Valley, MD) and MiscroScan WalkAway (Beckman Coulter Inc; Carlsbad, CA) systems versus reference agar dilution method for fosfomycin susceptibility determination in 200 Staphylococcus aureus clinical isolates. Both methods exhibit <= 89.0% of categorica agreement and >= 63.3% of very major error. All commercial antimicrobial susceptibility systems show poor concordance with reference method. (c) 2020 Elsevier Inc. All rights reserved.

Automated summary

Both BD Phoenix and MiscroScan WalkAway systems exhibited poor concordance with the reference agar dilution method for fosfomycin susceptibility determination in Staphylococcus aureus clinical isolates.