長崎県佐世保市内における犬心臓糸状虫の浸淫状況と媒介蚊に関する研究

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A field survey on the microfilarial prevalence of canine filariae among house dogs was made in Sasebo City, Western Japan in May and October, 1973 and May, 1974. Of 568 dogs examined, 199 or 35.0% were found to have microfilariae of Dirofilaria immitis in their peripheral blood. In the one-year-old dogs, the microfilarial prevalence was already over 10%. The prevalence reached 40% in the two-year-old and ranged from 30% to 60% in the older ones. No dogs having Dipetalonema reconditum microfilariae were found in the City. The spatial distribution of the positive dogs in Sasebo City suggest that the canine heartworm was transmitted more intensively in the suburban areas than in the urban or rural areas in the City. To determine the vector mosquitoes of D. immitis, mosquito collections were carried out in the City from July to September, 1976. Though 9 species of mosquitoes were collected by light traps at 5 stations in the suburban areas, Culex tritaeniorhynchus, Cx. pipiens pallens and Anopheles sinensis were predominant species. All of 1184 female mosquitoes examined, natural infections with developing or mature filarial larvae were found in 18 (9.4%) of Cx. p. pallens and 9 (1.4%) of Cx. tritaeniorhynchus. Infective larvae were found in only 3 of Cx. p. pallens. Species composition of mosquitoes collected by two methods, a human-bait-trap and a dog-bait-trap, was very similar to each other, and Cx. p. pallens was predominant. From he results of the mosquito survey, it was considered that Cx. p. pallens is the main vector of this parasite in the City, and may be important in transmitting the canine heartworm to man.
長崎大学熱帯医学研究所,Institute of Tropical Medicine, Nagasaki Universityの論文
1978-09-30

長崎県佐世保市内における犬心臓糸状虫の浸淫状況と媒介蚊に関する研究

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