Abstract
Streptococcus agalactiae is a leading cause of morbidity and mortality among neonates and causes severe infections in pregnant women and nonpregnant predisposed adults, in addition to various animal species worldwide. Still, information on the population structure of S. agalactiae and the geographical distribution of different clones is limited. Further data are urgently needed to identify particularly successful clones and obtain insights into possible routes of transmission within one host species and across species borders. We aimed to determine the population structure and virulence gene profiles of S. agalactiae strains from a diverse set of sources and geographical origins. To this end, 373 S. agalactiae isolates obtained from humans and animals from five different continents were typed by DNA microarray profiling. A total of 242 different S. agalactiae strains were identified and further analyzed. Particularly successful clonal lineages, hybridization patterns, and strains were identified that were spread across different continents and/or were present in more than one host species. In particular, several strains were detected in both humans and cattle, and several canine strains were also detected in samples from human, bovine, and porcine hosts. The findings of our study suggest that although S. agalactiae is well adapted to various hosts including humans, cattle, dogs, rodents, and fish, interspecies transmission is possible and occurs between humans and cows, dogs, and rabbits. The virulence and resistance gene profiles presented enable new insights into interspecies transmission and make a crucial contribution to the identification of suitable targets for therapeutic agents and vaccines.
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Acknowledgements
We thank the Institute of Medical Microbiology, University of Zurich, for providing strains.
Funding
All materials used for this study were funded by the Institute for Food Safety, University of Zurich. No third-party funding or external grants were involved.
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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as potential conflicts of interest.
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This study was carried out in accordance with ethical clearance and informed consent regulations of the locally cognizant ethics commission. All isolates were part of existing strain collections with anonymized sample information. No animal or human hosts were subjected to sampling for the purpose of the present study.
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Morach, M., Stephan, R., Schmitt, S. et al. Population structure and virulence gene profiles of Streptococcus agalactiae collected from different hosts worldwide. Eur J Clin Microbiol Infect Dis 37, 527–536 (2018). https://doi.org/10.1007/s10096-017-3146-x
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DOI: https://doi.org/10.1007/s10096-017-3146-x