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AEM Accepts, published online ahead of print on 25 May 2007
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Appl. Environ. Microbiol. doi:10.1128/AEM.02604-06
Copyright (c) 2007, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Mobile genetic elements provide evidence for a bovine origin of clonal complex 17 of Streptococcus agalactiae

Geneviève Héry-Arnaud, Guillaume Bruant, Philippe Lanotte, Stella Brun, Bertrand Picard, Agnès Rosenau, Nathalie van der Mee-Marquet, Pascal Rainard, Roland Quentin, and Laurent Mereghetti*

Université François-Rabelais, IFR 136, Faculté de Médecine, EA 3854 "Bactéries et risque materno-foetal", Tours, France; Centre Hospitalier Universitaire, Tours, France; Service de Microbiologie, Hôpital Avicenne, Assistance Publique-Hôpitaux de Paris, Bobigny, France; Institut National de la Recherche Agronomique, UR1282, Infectiologie Animale et Santé Publique, Nouzilly, France

* To whom correspondence should be addressed. Email: laurent.mereghetti{at}med.univ-tours.fr.


  Abstract

We sought an explanation for epidemiological changes in Streptococcus agalactiae infections, by investigating the link between ecological niches of the bacterium, by determining the prevalence of 11 mobile genetic elements. The prevalence of nine of these elements differed significantly according to the human or bovine origin of the isolate. Correlating this distribution with the phylogeny obtained by multilocus sequence analysis, we observed that human isolates harboring GBSi1, a clear marker of the bovine niche, clustered in clonal complex 17. Our results are thus consistent with the emergence of this virulent human clone from a bovine ancestor.






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