Abstract
The serologic prevalence of Dirofilaria immitis infection in 601 dogs in Washington was investigated in 1989-1990. Blood samples for serum were obtained from dogs approximately 2 yr of age or older in humane society shelters (n = 392) or veterinary clinics (n = 209). Serum samples were tested for heartworm infection using an enzyme-linked immunosorbent assay antigen test. Three (0.5%) dogs were positive for D. immitis infection, all of which were born and lived several years in states other than Washington. Heartworms have not been detected during the last 9 yr in the 1,203 dogs examined at the Washington Animal Disease Diagnostic Laboratory, Pullman, Washington. Consequently, the likelihood of indigenous heartworm infections in dogs in Washington remains low at this time.
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