| Project/Area Number |
14256003
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
寄生虫学(含医用動物学)
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| Research Institution | Nagasaki University |
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Principal Investigator |
TAKAGI Masahiro Nagasaki University, Institute of Tropical Medicine, Professor, 熱帯医学研究所, 教授 (60024684)
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| Co-Investigator(Kenkyū-buntansha) |
KAWADA Hitoshi Nagasaki University, Institute of Tropical Medicine, Assistant Professor, 熱帯医学研究所, 講師 (80363480)
TUNO Nobuko Nagasaki University, Institute of Tropical Medicine, Research Associate, 熱帯医学研究所, 助手 (60295102)
TANIMURA Susumu Nagasaki University, Institute of Tropical Medicine, Assistant Professor, 熱帯医学研究所, 助手 (60325678)
NAKAZAWA Shusuke Nagasaki University, Institute of Tropical Medicine, Assistant Professor, 熱帯医学研究所, 助手 (20180268)
SUGIYAMA Aikra Nagoya Women's University, Professor, 短期大学部・栄養科, 教授 (30196761)
津田 良夫 国立感染症研究所, 昆虫医科学部, 室長 (20207393)
吉村 光則 (吉村 充則) 総合地球環境学研究所, 研究推進センター, 助教授 (70283661)
沢辺 京子 国立感染症研究所, 昆虫医科学部, 室長 (10215923)
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| Project Period (FY) |
2002 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥36,010,000 (Direct Cost: ¥27,700,000、Indirect Cost: ¥8,310,000)
Fiscal Year 2005: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2004: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
Fiscal Year 2003: ¥12,870,000 (Direct Cost: ¥9,900,000、Indirect Cost: ¥2,970,000)
Fiscal Year 2002: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
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| Keywords | malaria vector / Japanese encephalitis vector / dengue / DHF vector / forest / southeast Asia / rice culture / urbanizing / environmental change |
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| Research Abstract |
An ecological survey was conducted in 4 areas in 3 southeast Asian countries with different natural and socio-economical environments to numerically evaluate environmental factors affecting to vector mosquitoes and mosquito-borne infectious diseases.
Conserved forest had favored infestation by An. minimus with high density, and resulted in maintaining the malaria epidemic in northern Thailand. In Lombok island, Indonesia malaria epidemic also was more serious in mountainous villages than in coastal ones. The main vector mosquito infested in dark forests was firstly confirmed as An. balabacensis. The species was strongly anthropophagous, exophagous, and an early night biter indicating that using a bed net only for sleeping was imperfect to avoid bites with risk of malaria transmission. The repellency of a new pyrethroid with high volatility impregnated resin net was evaluated as an additional control tool. Two nets per outdoor stage (ca. 6m^2) could protect human baits from biting for 3 months. In Binphuc Province, Vietnam, another mountainous area, the main vector was An. dirus. Spatial distributions of malaria patients and An. dirus were both aggregative but the overlapping of focuses of the two parameters was quite low.
An epidemiological survey on Japanese encephalitis and its vector mosquitoes conducted in a rural village near Hanoi, Vietnam revealed that Culex gelidus was more important vectors than as considered before. The study also detected a new virus named Namdinh virus from mosquito and patients showing Japanese encephalitis like symptom.
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