Porcine Reproductive and Respiratory Syndrome Virus Infection and Persistence of Abnormal Reproduction

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  • 豚繁殖・呼吸障害症候群ウイルス感染と豚異常産の持続
  • ブタ ハンショク コキュウ ショウガイ ショウコウグン ウイルス カンセン ト

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Abstract

During a period from April to December 1993, abnormal reproduction persisted in a pig farm in Chiba Prefecture, and porcine reproductive and respiratory syndrome (PRRS) virus was isolated from newborn and weaned piglets. Recurrent outbreaks of the reproductive failure and respiratory disorders had reccured in this farm and the retrospective serology revealed antibody positivity to PRRS virus since 1988. For prevention, breeder candidates were exposed to PRRS virus by penning together with seropositive animals prior to breeding, resulting in improvement of reproduction.

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