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OVINE PROGRESSIVE PNEUMONIA
A chronic, progressive, contagiousinterstitialpneumonitis of sheep in Europe and the U.S. Caused by a "slow virus" (family Lentiviridae); it is now believed that maedi and visna are two histopathological and clinical manifestations of the sameviral infection.
Synonym: ovine progressive pneumonia.
Origin: Icelandic, dyspnea