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Carattoli, Alessandra; Villa, Laura; Poirel, Laurent; Bonnin, Rémy A; Nordmann, Patrice
Antimicrobial Agents and Chemotherapy, 02/2012, Volume: 56, Issue: 2Journal Article
The blaNDM-1 gene has been reported to be often located on broad-host-range plasmids of the IncA/C type in clinical but also environmental bacteria recovered from the New Delhi, India, area. IncA/C-type plasmids are the main vehicles for the spread of the cephalosporinase gene blaCMY-2, frequently identified in the United States, Canada, and Europe. In this study, we completed the sequence of IncA/C plasmid pNDM-KN carrying the blaNDM-1 gene, recovered from a Klebsiella pneumoniae isolate from Kenya. This sequence was compared with those of three IncA/C-type reference plasmids from Escherichia coli, Yersinia ruckeri, and Photobacterium damselae. Comparative analysis showed that the blaNDM-1 gene was located on a widely diffused plasmid scaffold known to be responsible for the spread of blaCMY-2-like genes and consequently for resistance to broad-spectrum cephalosporins. Considering that IncA/C plasmids possess a broad host range, this scaffold might support a large-scale diffusion of the blaNDM-1 gene among Gram-negative rods.
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