Fosfomycin, from susceptibility to resistance: Impact of the new guidelines on breakpoints - 22/09/20
The GMC study group
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Highlights |
• | Fosfomycin is a mainstay for the treatment of community-acquired urinary tract infection (CA-UTI). |
• | The fosfomycin breakpoint for Enterobacterales has changed in the 2019 CA-SFM/EUCAST guidelines v2. |
• | Using new breakpoints, the overall reported rate of fosfomycin resistance increased by three-fold (5.6% vs 18.1%, P<0.01). |
• | In E. coli and K. pneumoniae, the reported rate of fosfomycin resistance reached 2.8% and 86.5%, respectively. |
• | The role of fosfomycin in the treatment of documented CA-UTI due to Enterobacterales other than E. coli should be assessed. |
Abstract |
The fosfomycin breakpoint using the disc diffusion method (DDM) changed in the 2019 CA-SFM/EUCAST guidelines v2 (24mm versus 19mm). We assessed its impact on categorization of Enterobacterales recovered from urine samples in emergency departments. A total of 7749 and 2348 strains were tested using the DDM and the broth microdilution method (BMD), respectively. The DDM with the 19-mm breakpoint was in accordance with the BMD. Using the 24-mm breakpoint, the overall rate of fosfomycin resistance in Enterobacterales increased by three-fold (5.6% vs 18.1%, P<0.01) and reached 2.8% and 86.5% in E. coli and K. pneumoniae, respectively. French guidelines for the management of community-acquired UTI remain appropriate. The accuracy of the methods for routine fosfomycin susceptibility testing should be assessed. The role of fosfomycin in the treatment of documented CA-UTI due to Enterobacterales other than E. coli should be evaluated considering its rate of resistance and recent data reporting low accuracy.
Le texte complet de cet article est disponible en PDF.Keywords : Fosfomycin, EUCAST, Urinary tract infection, Klebsiella spp.
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Vol 50 - N° 7
P. 611-616 - octobre 2020 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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