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• W2892691515 abstract "The identification and characterization of clinical Clostridioides difficile isolates with reduced fidaxomicin susceptibility.Agar dilution assays were used to determine fidaxomicin MICs. Genome sequence data were obtained by single-molecule real-time (SMRT) sequencing in addition to amplicon sequencing of rpoB and rpoC alleles. Allelic exchange was used to introduce the identified mutation into C. difficile 630Δerm. Replication rates, toxin A/B production and spore formation were determined from the strain with reduced fidaxomicin susceptibility.Out of 50 clinical C. difficile isolates, isolate Goe-91 revealed markedly reduced fidaxomicin susceptibility (MIC >64 mg/L). A V1143D mutation was identified in rpoB of Goe-91. When introduced into C. difficile 630Δerm, this mutation decreased fidaxomicin susceptibility (MIC >64 mg/L), but was also associated with a reduced replication rate, low toxin A/B production and markedly reduced spore formation. In contrast, Goe-91, although also reduced in toxin production, showed normal growth rates and only moderately reduced spore formation capacities. This indicates that the rpoBV1143D allele-associated fitness defect is less pronounced in the clinical isolate.To the best of our knowledge, this is the first description of a pathogenic clinical C. difficile isolate with markedly reduced fidaxomicin susceptibility. The lower-than-expected fitness burden of the resistance-mediating rpoBV1143D allele might be an indication for compensatory mechanisms that take place during in vivo selection of mutants." @default.
• W2892691515 created "2018-10-05" @default.
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• W2892691515 date "2018-09-20" @default.
• W2892691515 modified "2023-10-18" @default.
• W2892691515 title "Characterization of a clinical Clostridioides difficile isolate with markedly reduced fidaxomicin susceptibility and a V1143D mutation in rpoB" @default.
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• W2892691515 doi "https://doi.org/10.1093/jac/dky375" @default.
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