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The Prevalence of Elaphostrongylus Cervi Infection in Moose (Alces alces) in Southern Norway

Prevalensen av Elaphostrongylus cervi infeksjon hos elg (Alces alces) i Sør-Norge

Abstract

The prevalence of Elaphostrongylus cervi infection in moose shot during the hunting season 1983 in 47 different municipalities in Southern Norway was studied. E. cervi seemed to occur endemically in the population, as infection was found in 35 % of 1,982 moose examined. Diagnosis was made on the basis of the presence of eggs and first-stage larvae (L1) and associated histopathological lesions in the lung, and on the presence of L1 in the faeces. The prevalence varied considerably between different municipalities. No relationship was found between the prevalence of E. cervi and the population density of moose. The highest prevalence was found in municipalities where red deer harbouring E. cervi were also present. The prevalence among males was higher than among females, and that among yearlings higher than among calves and adults. In no case was infection found in animals 51/2 years of age or older. Carcass weight in infected adult moose was significantly lower than in non-infected adults.

Sammendrag

Prevalensen av Elaphostrongylus cervi infeksjon hos elg ble undersøkt hos dyr skutt under jakt høsten 1983 i 47 forskjellige kommuner i Sør-Norge. E. cervi ble påvist hos 35 % av 1.982 undersøkte dyr og ser ut til å forekomme endemisk i elgpopulasjonen. Grunnlaget for diagnosen i denne undersøkelsen er påvisning av egg og førstestadiums larver (L1) av E. cervi og histopatologiske forandringer forårsaket av disse i lungene og påvisning av L1 i avføringsprøver. Prevalensen varierte sterkt fra kommune til kommune. Det ble ikke funnet noen sammenheng mellom prevalens og populasjonstetthet av elg. Høyest prevalens hos elg ble funnet i kommuner der det er hjort som en vet er infisert med E. cervi. Hanndyr hadde høyere prevalens enn hunndyr, uansett alder, og åringer hadde høyere prevalens enn kalver og eldre dyr uansett kjøn. E. cervi ble ikke påvist hos elg som var 51/2 år eller eldre. Slaktevekten var signifikant lavere hos infiserte enn hos ikke infiserte dyr i aldersgruppen over 11/2 år. Den geografiske utbredelsen og den høye prevalensen av E. cervi infeksjon hos elg indikerer at dette ikke er et nyetablert vert / parasitt system. På tross av den påviste negative effekten av denne infeksjonen på dyras slakevekt viser undersøkelsen at parasiten antagelig bare er moderat patogen hos elg.

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Acknowledgement

This study was financially supported by the Norwegian Agricultural Research Council and by the Directorate for Nature Management. I thank Professor O. Helle and Dr. G. Holt for essential help and guidance, Dr. B. Gjerde for linguistic advice and P. O. Bjønnes, A. Husdal and B. Øien for technical assistance. Thanks are also due to county wildlife managers, local wildlife authorities and hunters throughout Southern Norway, whose assistance in collecting the material made this study possible.

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Stuve, G. The Prevalence of Elaphostrongylus Cervi Infection in Moose (Alces alces) in Southern Norway. Acta Vet Scand 27, 397–409 (1986). https://doi.org/10.1186/BF03548154

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