The whole genome sequencing of extensively drug-resistant Shewanella xiamenensis T17 isolated from hospital effluents in Algeria revealed the presence of a novel 268.4 kb plasmid designated pSx1, which carries several antibiotic-resistance genes in the novel Tn1696 derivative (Tn6297), in addition to the chromosomal blaOXA-48-like gene (blaOXA-416). The presence of the plasmid was confirmed by nuclease S1-PFGE analysis and transformation by electroporation into Escherichia coli DH10B. Tn6297 contains an In27 class 1 integron harboring the dfrA12-orfF-aadA2 array, msr(E) and mph(E) associated with IS26; a new efflux pump multidrug resistance composite transposon delimited by two ISEc29s; Tn-tet harboring tetR and tetA(C); a class 1 integron with the qacG gene cassette; qnrVC6 and dfrA23 associated with ISCR1; and a complex class 1 integron In4-like containing aacC1, aadA1, blaVEB-16, catA2, sul1Δ, cmlA9, tetR, tetA(G), aac(6′)-II, and blaPSE-1. Its mer operon carries merB, but lacks merC, in contrast to Tn1696 and Tn21. This study represents the first characterization of a multidrug-resistant transposon and multidrug resistance plasmid in Shewanella and is the first report of blaOXA-416 in Algeria, providing evidence that Shewanella spp. could be an important reservoir and vehicle for drug resistance genes.
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