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Boekhoud, Ilse M; Hornung, Bastian V H; Sevilla, Eloisa; Harmanus, Céline; Bos-Sanders, Ingrid M J G; Terveer, Elisabeth M; Bolea, Rosa; Corver, Jeroen; Kuijper, Ed J; Smits, Wiep Klaas
Nature communications, 01/2020, Letnik: 11, Številka: 1Journal Article
Metronidazole was until recently used as a first-line treatment for potentially life-threatening Clostridioides difficile (CD) infection. Although cases of metronidazole resistance have been documented, no clear mechanism for metronidazole resistance or a role for plasmids in antimicrobial resistance has been described for CD. Here, we report genome sequences of seven susceptible and sixteen resistant CD isolates from human and animal sources, including isolates from a patient with recurrent CD infection by a PCR ribotype (RT) 020 strain, which developed resistance to metronidazole over the course of treatment (minimal inhibitory concentration MIC = 8 mg L ). Metronidazole resistance correlates with the presence of a 7-kb plasmid, pCD-METRO. pCD-METRO is present in toxigenic and non-toxigenic resistant (n = 23), but not susceptible (n = 563), isolates from multiple countries. Introduction of a pCD-METRO-derived vector into a susceptible strain increases the MIC 25-fold. Our finding of plasmid-mediated resistance can impact diagnostics and treatment of CD infections.
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