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Serological Investigation of Granulocytic Ehrlichia Infection in Sheep in Norway

Acta Veterinaria Scandinavica, 2001, Vol.42(3), pp.331-338 [Peer Reviewed Journal]

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  • Title:
    Serological Investigation of Granulocytic Ehrlichia Infection in Sheep in Norway
  • Author: Stuen, S ; Bergstroem, K
  • Contributor: Stuen, S (correspondence author)
  • Found In: Acta Veterinaria Scandinavica, 2001, Vol.42(3), pp.331-338 [Peer Reviewed Journal]
  • Subjects: Fever ; Age ; Antibodies ; Grazing ; Infection ; Pasture ; Coasts ; Ixodes ; Ehrlichia Equi ; Animal Diseases ; Medical, Veterinary, and Agricultural Entomology ; Ehrlichia Phagocytophila ; Antibodies ; Lambs ; Seroprevalence.
  • Language: English
  • Description: Serum samples of 749 sheep from 75 sheep flocks in Norway, i.e. 361 lambs (6 to 7 months old) and 388 adults (>1.5 year), were analysed for antibodies to Ehrlichia equi. Ten animals from each flock were examined. Seropositive animals were found along the coast of southern Norway from Vestfold to Soer-Troendelag (as far north as 63 degree 38'N). Seropositive sheep were not found in southeast, east or northern Norway. Thirty-two flocks were seropositive, although tick-borne fever had only been diagnosed earlier in half of these. In 78% of the seropositive flocks, more than 80% of the sheep were seropositive. A total of 35.7 % and 36.3 % of lambs and adults were found seropositive, respectively. However, the overall seroprevalence among animals that had been grazing on Ixodes pastures were 0.80 for the lambs and 0.84 for the adults. Mean antibody titres ( plus or minus SD) (log sub(10)) in seropositive lambs and adults were 2.59 ( plus or minus 0.449) and 2.70 ( plus or minus 0.481), respectively. No significant differences in either seroprevalence or mean antibody titre between sheep of different ages were obtained in this study. Based on antibodies 94% of sheep flocks on Ixodes pastures were infected with a granulocytic Ehrlichia infection. The association between seropositive flocks and Ixodes infested pasture shows a very high degree of agreement (p & 0.00001). The present study indicates that granulocytic Ehrlichia infection in sheep is underdiagnosed in Norway.
  • Identifier: ISSN: 0044-605X ; E-ISSN: 1751-0147 ; DOI: 10.1186/1751-0147-42-331

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