Frontiers in microbiology · 2014
Replicon typing of plasmids carrying bla CTX-M-1 in Enterobacteriaceae of animal, environmental and human origin.
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Zurfluh Katrin, Jakobi Gianna, Stephan Roger, Hächler Herbert, Nüesch-Inderbinen Magdalena
Аннотация
OBJECTIVES: The aim of this work was to determine the plasmid replicon profiles of a collection of bla CTX-M-1-positive enterobacterial strains. The isolates originated from chicken in the production pyramid, healthy food-producing animals at slaughter (chicken, calves, and pigs), chicken retail meat, environmental isolates originating from water bodies, and isolates from humans. A selection of IncI and IncN plasmids were characterized by multilocus sequence typing in order to determine their epidemiological relatedness.
METHODS: Transconjugants of 74 bla CTX-M-1-positive isolates were analyzed by PCR-based replicon typing and by PCR-based plasmid multilocus sequence typing.
RESULTS: The incompatibility groups detected among the bla CTX-M-1-harboring plasmids included IncI1, IncN, IncHI1B, IncF, IncFIIS, IncFIB, and IncB/O, with plasmid lineage IncI1/ST3 predominating in isolates from chicken and from humans. Lineage IncN/ST1 was detected mainly in isolates from pigs. For the first time, bla CTX-M-1 genes encoded on IncHI1 plasmids were detected in isolates from cattle and from water bodies.
CONCLUSIONS: This study identifies plasmid lineages that are contributing to the dissemination of bla CTX-M-1 genes in the food chain, the environment, and humans.
METHODS: Transconjugants of 74 bla CTX-M-1-positive isolates were analyzed by PCR-based replicon typing and by PCR-based plasmid multilocus sequence typing.
RESULTS: The incompatibility groups detected among the bla CTX-M-1-harboring plasmids included IncI1, IncN, IncHI1B, IncF, IncFIIS, IncFIB, and IncB/O, with plasmid lineage IncI1/ST3 predominating in isolates from chicken and from humans. Lineage IncN/ST1 was detected mainly in isolates from pigs. For the first time, bla CTX-M-1 genes encoded on IncHI1 plasmids were detected in isolates from cattle and from water bodies.
CONCLUSIONS: This study identifies plasmid lineages that are contributing to the dissemination of bla CTX-M-1 genes in the food chain, the environment, and humans.