ArticleThe Journal of antimicrobial chemotherapy2025
Determination of epidemiological cut-off values for Narasin, Salinomycin, Lasalocid and Monensin in Enterococcus faecium.
Article in The Journal of antimicrobial chemotherapy, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Narasin used as a feed additive in conventional rearing of broilers can co-select for vancomycin-resistant Enterococcus faecium through the NarAB ionophore resistance mechanisms.The Journal of antimicrobial chemotherapy · 2026Article
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Authors and funding
20 authors.
Funding
Abstract
objectivesTo establish epidemiological cut-off values (ECOFFs) for the polyether ionophores narasin, salinomycin, lasalocid and monensin in Enterococcus faecium.
methodsMICs were measured using the broth microdilution method according to ISO 20776-1 (2019). Method validation involved ≥10 replicates of antimicrobial susceptibility testing of Enterococcus faecalis ATCC 29212. A total of 182 E. faecium isolates from various sources were tested in five European laboratories. The ECOFFinder tool from EUCAST was used to establish the ECOFFs for 122 WT isolates, verified by PCR or WGS.
resultsMethod validation showed consistency, with acceptable variation within ±1 2-fold dilution. The ECOFF for narasin was 0.5 mg/L, considerably below the current EUCAST ECOFF for E. faecium (ECOFF = 2 mg/L). Salinomycin and lasalocid ECOFFs were 1 and 2 mg/L, respectively. Strains carrying the previously identified narAB resistance genes clearly manifested a separate MIC distribution for narasin and salinomycin, but not for lasalocid, although a clear bias to the higher MIC values within the normal distribution could be observed. Monensin apparently displayed a broader MIC range (0.5-64 mg/L) with multiple modes, which precluded the establishment of an ECOFF for monensin.
conclusionsThe study yielded novel ECOFFs for distinguishing WT E. faecium strains for the key veterinary ionophores, providing a mainstay for a better understanding of ionophore resistance in enterococci.
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