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The aim of the present study was to evaluate the seroprevalence of<jats:italic>B. burgdorferi<\/jats:italic>sensu lato and<jats:italic>A. phagocytophilum<\/jats:italic>in Danish horses.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total of 390 blood samples collected from all major regions of Denmark and with a geographical distribution corresponding to the density of the Danish horse population were analyzed. All samples were examined for the presence of antibodies against<jats:italic>B. burgdorferi<\/jats:italic>sensu lato and<jats:italic>A. phagocytophilum<\/jats:italic>by the use of the SNAP<jats:sup>\u00ae<\/jats:sup>4DX<jats:sup>\u00ae<\/jats:sup>ELISA test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Overall, 29.0% of the horses were seropositive for<jats:italic>B. burgdorferi<\/jats:italic>sensu lato whereas 22.3% were seropositive for<jats:italic>A. phagocytophilum<\/jats:italic>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Antibodies against<jats:italic>B burgdorferi<\/jats:italic>sensu lato and<jats:italic>A. phagocytophilum<\/jats:italic>are commonly found among Danish horses thus showing that Danish horses are frequently infected by these organisms.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1751-0147-52-3","type":"journal-article","created":{"date-parts":[[2010,1,19]],"date-time":"2010-01-19T07:15:50Z","timestamp":1263885350000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":47,"title":["Seroprevalence of Borrelia burgdorferi sensu lato and Anaplasma phagocytophilum in Danish horses"],"prefix":"10.1186","volume":"52","author":[{"given":"Marie GB","family":"Hansen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mette","family":"Christoffersen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Line R","family":"Thuesen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Morten R","family":"Petersen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anders M","family":"Bojesen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2010,1,18]]},"reference":[{"key":"571_CR1","first-page":"144","volume-title":"44th Proceedings of the Annual Convention of the AAEP: 6-9 December 1998; Baltimore","author":"TB Manion","year":"1998","unstructured":"Manion TB, Bushmich SL, Mittel L, Laurendeau M, Werner H, Reilly M: Lyme disease in horses: Serological and antigen testing differences. 44th Proceedings of the Annual Convention of the AAEP: 6-9 December 1998; Baltimore. 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