Global spread of vancomycin-resistant Enterococcus faecium from distinct nosocomial genetic complex

Rob J.L. Willems*, Janetta Top, Marga Van Santen, D. Ashley Robinson, Teresa M. Coque, Fernando Baquero, Hajo Grundmann, Marc J.M. Bonten

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

377 Citations (Scopus)

Abstract

Vancomycin-resistant enterococci (VRE) have caused hospital outbreaks worldwide, and the vancomycin-resistance gene (vanA) has crossed genus boundaries to methicillin-resistant Staphylococcus aureus. Spread of VRE, therefore, represents an immediate threat for patient care and creates a reservoir of mobile resistance genes for other, more virulent pathogens. Evolutionary genetics, population structure, and geographic distribution of 411 VRE and vancomycin-susceptible Enterococcus faecium isolates, recovered from human and nonhuman sources and community and hospital reservoirs in 5 continents, identified a genetic lineage of E. faecium (complex-17) that has spread globally. This lineage is characterized by 1) ampicillin resistance, 2) a pathogenicity island, and 3) an association with hospital outbreaks. Complex-17 is an example of cumulative evolutionary processes that improved the relative fitness of bacteria in hospital environments. Preventing further spread of this epidemic E. faecium subpopulation is critical, and efforts should focus on the early disclosure of ampicillin-resistant complex-17 strains.

Original languageEnglish
Pages (from-to)821-828
Number of pages8
JournalEmerging Infectious Diseases
Volume11
Issue number6
DOIs
Publication statusPublished - 1 Jan 2005

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