Abstract
The tapeworm Echinococcus multilocularis is the causative agent of alveolar echinococcosis, the most serious parasitic disease for humans in Europe. In Europe, the E. multilocularis lifecycle is based on a prey–predator relationship between the red fox and small rodents. Over the last three decades, the surveillance of E. multilocularis infection in red foxes has led to the description of a wider distribution pattern across Europe. France constitutes the current European western border, but only the north-eastern half of the country is considered endemic. The red fox is the host mainly targeted in E. multilocularis surveillance programmes, but surveys targeting small rodents may be useful for obtaining molecular data, especially when the time-consuming trap** is already carried out in dedicated pest-control programmes. Here, we screened for parasitic lesions in the livers of 1238 Arvicola terrestris voles originating from the historical, but neglected focal area located in central France (Auvergne region) and from Hautes-Alpes, a recently identified endemic department in south-eastern France. This screening identified six voles infected with E. multilocularis in Hautes-Alpes and none in Puy-de-Dôme (Auvergne region) after molecular confirmation. The absence of infected rodents from Puy-de-Dôme can be mainly explained by the generally low prevalence reported in intermediate hosts. The infected Hautes-Alpes samples come all from the same trap** site situated at around 5 km from one of the three fox faecal samples with E. multilocularis DNA collected 15 years prior, thereby confirming the existence and persistence of the E. multilocularis lifecycle in the area. All the rodent E. multilocularis samples from Hautes-Alpes showed the same EmsB microsatellite marker profile. This profile has previously been described in Europe only in the Jura department (central eastern France), located at least 180 km further north. Successive migrations of infected foxes from the historical focal area, including from Jura, to Hautes-Alpes may explain the detection of the parasite in A. terrestris in Hautes-Alpes. Existing trap** efforts in areas where farmers trap A. terrestris for surveillance and pest control can be an effective complement to sampling foxes or fox faeces to obtain E. multilocularis molecular profiles.
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Acknowledgements
The authors are grateful to Etienne Ramadier, Gaëlle Sobzyck-Moran and Cedric Jaquet from VetAgro Sup and the ‘Communauté de communes du Briançonnais’ involved in A. terrestris trap**, Michel Munier and Nicolas Penel from ANSES for hel** with rodent necropsy.
Funding
Trap** from Auvergne was supported by the European Union through ERDF funds and the Auvergne Regional Council (‘Contribution à la lutte contre les campagnols terrestres’ programme).
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Umhang, G., Demerson, JM., Legras, L. et al. Rodent control programmes can integrate Echinococcus multilocularis surveillance by facilitating parasite genoty**: the case of Arvicola terrestris voles screening in France. Parasitol Res 120, 1903–1908 (2021). https://doi.org/10.1007/s00436-021-07126-7
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DOI: https://doi.org/10.1007/s00436-021-07126-7