A Comparative Study on the Distribution, Incidence and Periodicity of the Canine Filarial Worms Dirofilaria Immitis Leidy and Dipetalonema Reconditum Grassi in Hawaii1

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Abstract
A survey of canine filariasis involving 666 mature dogs was made on all major islands of Hawaii. Two filarial worms, Dirofilaria immitis Leidy and Dipetalonema reconditum Grassi, were present. The overall filarial incidence was 45.2% with D. immitis being the more prevalent parasite. Periodicity studies showed that D. immitis microfilariae had a nocturnal periodicity, whereas the microfilariae of D. reconditum exhibited a periodic cycle with both a diurnal and a nocturnal peak. Data are presented also on the microfilarial morphology and on the possible arthropod vectors involved.

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