Pathology of Porcine Reproductive and Respiratory Syndrome

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  • 豚繁殖・呼吸障害症候群の病理学的観察
  • ブタ ハンショク コキュウ ショウガイ ショウコウグン ノ ビョウリガクテキ

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Abstract

Pathological study was performed on 2 natural cases from which porcine reproductive and respiratory syndrome (PRRS) virus was isolated, as well as 6 cases inoculated intranasally with lung homogenates of infected piglets. Slight interstitial pneumonia was observed in a dead 2-day-old piglet from a high abortion rate farm. The other fatal case of 2-month-old piglet showed severe abdominal breathing, purulent bronchopneumonia, interstitial pneumonia, interstitial myocarditis, myocardial necrosis, subcutaneous and thoracic lymphadenitis and nonpurulent encephalitis. In inoculated animals interstitial pneumonia was observed at 1 week. At 4 weeks after inoculation, subcutaneous and thoracic lymph nodes were enlarged and histopathologically, interstitial pneumonia, interstitial myocarditis, subcutaneous and thoracic lymphadenitis, and nonpurulent encephalitis were observed.

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