Phylogeny, resistome and mobile genetic elements of emergent OXA-48 and OXA-245 Klebsiella pneumoniae clones circulating in Spain

The Journal of Antimicrobial Chemotherapy
María Pérez-VázquezRobert A Kingsley

Abstract

The global emergence of OXA-48-producing Klebsiella pneumoniae clones is a significant threat to public health. We used WGS and phylogenetic analysis of Spanish isolates to investigate the population structure of blaOXA-48-like-expressing K. pneumoniae ST11 and ST405 and to determine the distribution of resistance genes and plasmids encoding blaOXA-48-like carbapenemases. SNPs identified in whole-genome sequences were used to reconstruct phylogenetic trees, identify resistance determinants and de novo assemble the genomes of 105 blaOXA-48-like-expressing K. pneumoniae isolates. Genome variation was generally lower in outbreak-associated isolates compared with those associated with sporadic infections. The relatively limited variation observed within the outbreak-associated isolates was on average 7-10 SNPs per outbreak. Of 24 isolates from suspected sporadic infections, 7 were very closely related to isolates causing hospital outbreaks and 17 were more diverse and therefore probably true sporadic cases. On average, 14 resistance genes were identified per isolate. The 17 ST405 isolates from sporadic cases of infection had four distinct resistance gene profiles, while the resistance gene profile differed in all ST11 isolates from...Continue Reading

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