An Outbreak of Ibaraki Disease of Cattle in Miyazaki Prefecture

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  • 宮崎県に発生したイバラキ病とその疫学
  • 宮城県に発生したイバラキ病とその疫学
  • ミヤギケン ニ ハッセイシタ イバラキビョウ ト ソノ エキガク

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Abstract

In 1987, an outbreak of Ibaraki disease of cattle occurred in Miyazaki Prefecture, and 76 of 993 cattle raised on 75 farms showed clinical signs of fever, profuse salivation, coughing and laryngoparalysis, and 12 of affected cattle died. The Ibaraki virus was isolated from 17 of 45 blood samples collected from affected. animals. The virus neutralization (VN) test against the virus revealed that the antibody positive ratios converted from 12.8%(33/258) at the early stage of outbreak to 51.8%(169/326) at the last stage of the outbreak.<BR>The Ibaraki virus could be isolated from 3 of 5 sentinel cattle which had been kept on 2 farms in the district. These sentinel cattle excreted the virus during a period from 1 to 2 months without showing any clinical signs. The virus was not isolated from Culicoides oxystoma or other species of Culicoides, which were suspected to be vectors of the virus, throughout the outbreak.

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