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長崎市内での犬フィラリア伝搬におけるチカイエカとアカイエカの役割の比較


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Title: 長崎市内での犬フィラリア伝搬におけるチカイエカとアカイエカの役割の比較
Other Titles: Comparative Studies on the Role of the Culex pipiens molestus and Culex pipiens pallens Mosquitoes in Transmitting Dog Filaria, Dirofilaria immitis, in Nagasaki City
Authors: 在津, 誠
Authors (alternative): Zaitsu, Makoto
Issue Date: 30-Jun-1988
Publisher: 長崎大学熱帯医学研究所 / Institute of Tropical Medicine, Nagasaki University
Citation: 熱帯医学 Tropical medicine 30(2). p141-154, 1988
Abstract: チカイエカの犬フィラリアに対する伝搬能力を同じアカイエカ群に属し,長崎市内での犬フィラリアの主要伝搬蚊であるアカイエカと比較した.実験室内において,種々の程度のミクロフィラリア密度(800-5000/30mm^3)を持つ犬から長崎産のチカイエカとアカイエカを吸血させた.吸血した蚊は,気温25℃,湿度70%, 16時間照明の条件下で15日間飼育した.その結果,蚊でのミクロフィラリアの中腸へのとり込み方と,ミクロフィラリアのマルピーギ管への移動の割合には,両者の蚊で差は認められなかった.しかし,吸血蚊の15日目の生存率はチカイエカ(0.0-20.8%)の方がアカイエカ(41.2-81.8%)にくらべ著しく低かった.また,チカイエカの実験感染指数は,どのミクロフィラリア密度の実験でも,アカイエカより低かった.さらに,野外においてライトトラップを用いてアカイエカ群成虫を採集し,それらについて犬フィラリア感染率をしらべた.調査は長崎大学医学部構内とそこから約2km離れたアパートで,1986年と1987年の4月から11月上旬に行なった.チカエイカとアカイエカは個眼数の違いによって判別した. 2ヶ年の結果を合計すると,チカイエカの自然感染率は0.4%,アカイエカでは5.4%で,チカイエカの方がアカイエカにくらべて著しく低いことがわかった.以上の実験感染と自然感染の結果から,野外におけるチカイエカの犬フィラリア伝搬に対する役割は,アカイエカにくらべて極めて低いものと結論された. / The vector potential to Dirofilaria immitis of Culex pipiens molestus, a member of the Culex pipiens complex, was compared with that of Culex pipiens pallens, another member of the complex. In the laboratory, both mosquitoes were fed on a dog with various levels of microfilaremia. The mean number of microfilariae taken up by the mosquitoes and the rate of migration to Malpighian tubules for Cx. p. molestus was similar to that for Cx. p. pallens. However, the survival rate of Cx. p. molestus after feeding on the dog was lower than that of Cx. p. pallens. The lower survival rate of Cx. p. molestus was the main cause of the lower index of experimental infection. By a light trap, females of Culex pipiens complex were collected at two sites in Nagasaki City in 1986 and 1987. Cx. p. molestus was distinguished from Cx. p. pallens by the number of ommatidia in the compound eyes. Mosquitoes were dissected and examined for the presence of D. immitis larvae in proboscis, thorax, abdomen and Malpighian tubules. Natural infection rate of Cx. p. pollens was distinctly higher than that of Cx. p. molestus. Results of experimental infection and field survey clearly indicate that Cx. p. molestus is apparently not as important as Cx. p pallens in the transmission of D. immitis.
URI: http://hdl.handle.net/10069/4522
ISSN: 03855643
Type: Departmental Bulletin Paper
Appears in Collections:Volume 30, No. 2

Citable URI : http://hdl.handle.net/10069/4522

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