Yersinia spp. in Wild Rodents and Shrews in Finland

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Joutsen , S , Laukkanen-Ninios , R , Henttonen , H , Niemimaa , J , Voutilainen , L , Kallio , E R , Helle , H , Korkeala , H & Fredriksson-Ahomaa , M 2017 , ' Yersinia spp. in Wild Rodents and Shrews in Finland ' , Vector Borne and Zoonotic Diseases , vol. 17 , no. 5 , pp. 303-311 .

Title: Yersinia spp. in Wild Rodents and Shrews in Finland
Author: Joutsen, Suvi; Laukkanen-Ninios, Riikka; Henttonen, Heikki; Niemimaa, Jukka; Voutilainen, Liina; Kallio, Eva R.; Helle, Heikki; Korkeala, Hannu; Fredriksson-Ahomaa, Maria
Contributor organization: Departments of Faculty of Veterinary Medicine
Food Hygiene and Environmental Health
Maria Fredriksson-Ahomaa / Principal Investigator
University of Helsinki
Hannu Korkeala / Principal Investigator
Department of Virology
Date: 2017-05
Language: eng
Number of pages: 9
Belongs to series: Vector Borne and Zoonotic Diseases
ISSN: 1530-3667
Abstract: Yersinia enterocolitica and Yersinia pseudotuberculosis are important zoonotic bacteria causing human enteric yersiniosis commonly reported in Europe. All Y. pseudotuberculosis strains are considered pathogenic, while Y. enterocolitica include both pathogenic and nonpathogenic strains which can be divided into six biotypes (1A, 1B, and 2-5) and about 30 serotypes. The most common types causing yersiniosis in Europe are Y. enterocolitica bioserotypes 4/O:3 and 2/O:9. Strains belonging to biotype 1A are considered as nonpathogenic because they are missing important virulence genes like the attachment-invasion-locus (ail) gene in the chromosome and the virulence plasmid. The role of wild small mammals as a reservoir of enteropathogenic Yersinia spp. is still obscure. In this study, the presence of Yersinia spp. was examined from 1840 wild small mammals, including voles, mice, and shrews, trapped in Finland during a 7-year period. We isolated seven Yersinia species. Y. enterocolitica was the most common species, isolated from 8% of the animals; while most of these isolates represented nonpathogenic biotype 1A, human pathogenic bioserotype 2/O:9 was also isolated from a field vole. Y. pseudotuberculosis of bioserotype 1/O:2 was isolated from two shrews. The ail gene, which is typically only found in the isolates of biotypes 1B and 2-5 associated with yersiniosis, was frequently (23%) detected in the nonpathogenic isolates of biotype 1A and sporadically (6%) in Yersinia kristensenii isolates. Our results suggest that wild small mammals, especially voles, may serve as carriers for ail-positive Y. enterocolitica 1A and Y. kristensenii. We also demonstrate that voles and shrews sporadically excrete pYV-positive Y. enterocolitica 2/O:9 and Y. pseudotuberculosis 1/O:2, respectively, in their feces and, thus, can serve as a contamination source for vegetables by contaminating the soil.
Subject: ail gene
wild small mammals
3142 Public health care science, environmental and occupational health
413 Veterinary science
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion

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