Congenital Malformation in Calves Associated with Aino Virus Prevalence in Fukuoka Prefecture in 1995 to 1996

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  • 福岡県におけるアイノウイルス流行にともなう牛異常産の多発
  • フクオカケン ニ オケル アイノ ウイルス リュウコウ ニ トモナウ ウシ イ

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During a period of September 1995 to April 1996, 82 abnormal deliveries and 47 cases congenital malformation of calves with kyphoscreliosis, arthrogryposis, hydranencephaly and cerebellar hypoplasia, occurred in Fukuoka Prefecture. Most sera and body fluids from the dams and affected calves had neutralizing antibody to Aino virus, high titered antibody was detected from precolostral sera from affected calves and the fetal fluids. Sera collected in 1995 from 100 sentinel calves of 50 farms were examined for antibody to Aino virus, revealing that seroconversion occurred first in one case in September, 25 cases in October and 3 cases in November. These findings suggested that Aino virus infection might play an etiological role in the abnormal deliveries and that the in utero infection occurred around 120 to 150 days of gestation.

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