Molecular epidemiology of emergent multidrug-resistant Salmonella enterica serotype Typhimurium strains carrying the virulence resistance plasmid pUO-StVR2
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Abstract
Objectives: To evaluate the incidence of a distinct multidrug-resistant (MDR) grouping of Salmonella serotype Typhimurium strains carrying the hybrid virulence resistance plasmid pUO-StVR2, and its possible evolution in the region where it was first detected [Principality of Asturias (PA), Spain].
Methods: pUO-StVR2-containing isolates were tentatively identified by two genetic markers: the blaOXA-30 gene and the class 1 integron InH:2000 bp/blaOXA-30-aadA1a. Positive isolates were examined for resistance profile (RP), plasmid content, virulence profile (VP) and genomic polymorphisms using macrorestriction–PFGE.
Results: A total of 182 out of 248 Typhimurium clinical isolates recorded in the PA over 2001–02 were ampicillin-resistant and could be distributed into several MDR groupings. A MDR grouping carrying pUO-StVR2, with a defined RP (AMP/blaOXA-30, CHL/catA1, [STR-SPT]/[strA/B,aadA1a], SUL/[sul1,sul2], TET/tet(B), qacEΔ1, merA, ±TMP/dfrA12, and containing InH), was represented by 49 isolates. The VPs of these isolates (24 genes screened) differed from that of the type strain LT2 by the absence of the sopE1 and pef genes. Macrorestriction analysis established six combined XbaI/BlnI PFGE profiles, and supported a clonal relationship among most of the isolates.
Conclusions: During 2001–02, the isolates carrying pUO-StVR2 constituted the second most frequent S. Typhimurium MDR grouping recorded in the PA, preceded only by the pandemic pentaresistant DT104. Polymorphisms on the genomic DNA, different phage types, different plasmid profiles and the detection of trimethoprim resistance in one isolate encoded by an additional plasmid, were consistent with both intra-cluster evolution and horizontal transfer of the hybrid plasmid
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This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Antimicrobial Chemotherapy following peer review. The version of record Molecular epidemiology of emergent multidrug-resistant Salmonella enterica serotype Typhimurium strains carrying the virulence resistance plasmid pUO-StVR2 is available online at: https://doi.org/10.1093/jac/dki400
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A. Herrero, M. R. Rodicio, M. A. González-Hevia, M. C. Mendoza, Molecular epidemiology of emergent multidrug-resistant Salmonella enterica serotype Typhimurium strains carrying the virulence resistance plasmid pUO-StVR2, Journal of Antimicrobial Chemotherapy, Volume 57, Issue 1, January 2006, Pages 39–45, https://doi.org/10.1093/jac/dki400
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https://doi.org/10.1093/jac/dki400Sponsors
We thank the personnel of the Microbiology Laboratories of the ‘Hospital Central de Asturias’ (Oviedo), ‘Hospital San Agustín’ (Avilés), ‘Hospital de Jarrio’, ‘Hospital de Cabueñes’ (Gijón), and ‘Hospital Carmen and Severo Ochoa’ (Cangas de Narcea) for their invaluable collaboration with the LSP in registering clinical isolates of Salmonella. We also thank Dr B. Guerra for his helpful comments. This work has been supported by a grant from the ‘Fondo de Investigación Sanitaria’ (ref. 02/0172). A. H. is the recipient of a grant from the ‘Fundación para el Fomento en Asturias de la Investigación Científica Aplicada y la Tecnología’ (FICYT, ref. BP04-086)