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Retrospective evaluation of laboratory data on canine vector-borne infections from the years 2004-2008.

The detection and therapy of canine vector-borne diseases in imported dogs are of major importance in small animal practice. Over the last years, the import of dogs from the Mediterranean region and Southeast Europe has increased, countries often endemic for a variety of vector-borne diseases such as babesiosis, hepatozoonosis, leishmaniosis, dirofilariosis or ehrlichiosis. This retrospective study presents the evaluation of data from our diagnostic laboratory on vector-borne infections in imported dogs from the years 2004-2008. Specific antibodies were detectable in 20.5% of all samples with individual detection rates of 8.9%, 9.6% and 10.8% for Babesia canis ssp., Leishmania spp. and/or Ehrlichia canis. A total of 5.5% of all samples tested by direct methods were positive. Up to 1.1% of Giemsa-stained blood/buffy coat smears were positive for B. canis ssp., Rickettsia spp. or Hepatozoon spp. Microfilariae were detectable by the Knott's Test in 6.4% and heartworm antigen was detectable using the DiroChek-ELISA in 3% of the examined samples. EDTA-blood samples were positive for Leishmania spp.-(14.9%), E. canis- (5.3%) and A. phagocytophilum-DNA (5.0%) by PCR. Therewith, imported dogs have a high chance of being carriers of pathogens. As some diseases may also be of a zoonotic concern, in case of the availability of competent vectors, the key focus in the future should be aimed at the prevention of importing infected dogs or at compulsory diagnostic screening and treatment of infected dogs at the time of import.