| Project/Area Number |
07456138
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied veterinary science
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
TAKASHIMA Ikuo Hokkaido Univ., Grad.School of Vet.Med.., Pro., 大学院・獣医学研究科, 教授 (30002083)
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| Co-Investigator(Kenkyū-buntansha) |
KARIWA Hiroaki Hokkaido Univ., Grad.School of Vet.Med., Lecturer., 大学院・獣医学研究科, 講師 (70224714)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1995: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Viral encephalitis / Tick-borne infection / Arbovirus / Rossian Spring Summer encephalitis |
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| Research Abstract |
Epidemiological investigations of tick-borne encephalitis were performed in the endemic foci where the tick-borne encephalitis patient was found and also in the other areas in Hokkaido. Results wre summarized as follows.
1) In 1995, three strains of tick-borne enchephalitis virus were isolated from the blood of the sentinel dogs which were kept in the area where the patient was found.
2) Two strains of tick-borne encephalitis were isolated from 600 individuals of Ixodes ovatus ticks, giving a field infection rate of 0.3% (2/600).
3) Two strains of tick-borne encephalitis virus were isolated from rodents, one from Apodemus speciosus and another from Clethrionomis rufocanus.
4) Virus strains isolated from dogs, ticks and rodents were identifiend as Russian Spring Summer encephalitis type of tick-borne encephalitis virus.
5) Endemic ares of the virus were distributed in 4 districs of southern Hokkaido. These results indicate that tick-borne encephalitis virus is endemic in Hokkaido and maintained by the vector ticks Ixodes ovatus and rodents.
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