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The response of swine to an ovine pneumonia virus


, : The response of swine to an ovine pneumonia virus. Bull Inst Zool Acad Sinica 1(1): 29-40

Sheep pneumonia virus (Boidin's strain SPB) is definitely pathogenic for pigs by the intratracheal route. It produces characteristic pneumonia and clinical symptoms identical to those seen in the sheep host. Acute bronchopneumonia appears in the early stage followed by progressive lymphoid hyperplasia around the bronchioles and vascular walls. A histological resemblance to virus pneumonia of pigs occurrs from the 8th day onward after inoculation. Lung lesions are primarily lobular in nature, by confluence occasional lobar involvement is observed. Neutrophils are the earliest inflammatory cells in response to the virus inoculation. Intracytoplasmic elementary bodies are usually found in neutrophils and mononuclears in the early stage of infection. Virus is recovered from lungs 4-8 days after primary inoculation, but not after 15 days. In challenge experiments, virus is recovered from the lungs on the 4th day, but not on the 9th day, after inoculation. Viremia is not demonstrable within 4 days after primary inoculation.

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