Prevalence of Dirofilaria immitis Infection in Cats in Saitama, Japan.

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Abstract
To clarify Dirofilaria immitis infection among cats in Saitama Prefecture, Japan, 1,840 cats were examined postmortem for adult worms and microfilariae in the blood from 1989 to 1995. As a reference control, 500 dogs from the same area were examined in the same way and period. D. immitis worms were found in 15 cats, one of which had microfilariae in the blood. Prevalence rate of D. immitis infection was 0.8% (15/1,840) in cats and 46.8% (234/500) in dogs examined, whereas it was 4.1% and 64.6% in cats and dogs, respectively, aged 2 years and over. Worm burden per positive cat was 1.5 +/- 0.7 (mean +/- SD), the maximum number of worm was 3 in 2 cats, and 10 cats had a single worm each. All the worm-positive cats were tested for antibodies to feline immunodeficiency virus (FIV) and antigens of feline leukemia virus (FeLV) in sera. Positive rates of coinfection with D. immitis were 26.7% and 13.3% for FIV and FeLV, respectively.

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