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epidemiological aspects of filariosis in dogs on the coast of paraná state, brazil: with emphasis on dirofilaria immitis.the present study determined the prevalence and geographical distribution of dirofilaria immitis and other filariae, from dogs in littoral areas of paraná state, in brazil. this survey spanned eight months, between 1998 and 1999, and was also designed to compare the efficacy of different tests for diagnosis of heartworm infection in that area. blood samples were collected from 256 native-owned dogs distributed along the paraná coastal area. five diagnostic procedures were used: direct smear exam ...200415262005
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