長崎県で発生した牛流行熱

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タイトル別名
  • An outbreak of bovine ephemeral fever in Nagasaki Prefecture in 1988.
  • 長崎県で発生した牛流行熱〔英文〕
  • ナガサキケン デ ハッセイシタ ウシ リュウコウ ネツ エイブン

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In October, 1988, bovine ephemeral fever (BEF) occurred in Nagasaki Prefecture and throughout Kyushu island, with the exception Miyazaki Prefecture. The first outbreak occurred in Hirado-shi on October 17. The total number of diseased cattle was 24 in 24 farms in Nagasaki Prefecture. The clinical findings were mainly sudden fever, anorexia, and instability in standing. The serum neutralizing antibodies against BEF virus (BEFV) rose in all infected cattle. Twelve strains of the virus were isolated in HmLu-1 cell cultures made directly from the heparinized blood of 17 infected cattle. The buffy coat was mainly collected from the samples and washed three times with phosphate buffered saline. These isolates were all neutralized by an antiserum against BEFV (Yamaguchi strain). With the aid of an electron microscope, a representative of isolates named Hirado-9 with a length of 150nm was seen in the sample of infected HmLu-1 cell cultures. Both Hirado-9 and Yamaguchi strains reacted with antisera. The outbreak of BEF in 1988 was the first since 1971 in Nagasaki Prefecture. The result proved that BEFV can be easily isolated in HmLu-1 cell culture from the washed blood cells of infected cattle.

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