Equine Getah Virus Infection: Isolation of the Virus from Racehorses During an Enzootic in Japan

M. KamadaEpizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4, Kamishiba, Kokubunji-machi, Shimotsuga-gun, Tochigi-ken 329-04, Japan

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Y. AndoEpizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4, Kamishiba, Kokubunji-machi, Shimotsuga-gun, Tochigi-ken 329-04, Japan

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Y. FukunagaEpizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4, Kamishiba, Kokubunji-machi, Shimotsuga-gun, Tochigi-ken 329-04, Japan

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T. KumanomidoEpizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4, Kamishiba, Kokubunji-machi, Shimotsuga-gun, Tochigi-ken 329-04, Japan

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H. ImagawaEpizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4, Kamishiba, Kokubunji-machi, Shimotsuga-gun, Tochigi-ken 329-04, Japan

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R. WadaEpizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4, Kamishiba, Kokubunji-machi, Shimotsuga-gun, Tochigi-ken 329-04, Japan

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Y. AkiyamaEpizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4, Kamishiba, Kokubunji-machi, Shimotsuga-gun, Tochigi-ken 329-04, Japan

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A primary enzootic of equine Getah virus infection involving 722 of 1,903 racehorses occurred at a training center in Japan between September and November of 1978. Sixty-two viral agents were isolated from the plasma of 209 sick horses which exhibited pyrexia with rectal temperatures ranging from 38.5–40°C, urticarial rash on various portions of the body, and edema of the hind legs. The viruses were antigenically related to the AMM 2021, Haruna, and Sagiyama strains of Getah virus. Infection and disease were produced experimentally in horses when inoculated by the intramuscular or intranasal routes.

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