ACVPM Infectious Diseases Practice Exam

Ovine Progressive Pneumonia (OPP) is also known as Maedi-Visna.

Maedi-Visna Sheep Respiratory Disease Caprine Arthritis Encephalitis Bovine Leukosis

Correct Answer:

Maedi-Visna

Explanation:

Maedi-Visna is the recognized alternative name for the same chronic ovine lentiviral infection. Ovine Progressive Pneumonia (OPP) refers to this disease in sheep, and the virus involved is the Maedi-Visna virus (MVV). Historically, two syndromes were described—Maedi, a progressive dyspnea from interstitial pneumonia, and Visna, a wasting or demyelinating form—together defining the disease entity. So the term Maedi-Visna is used interchangeably with OPP. The other options point to diseases in goats or cattle, or to generic terms not used as the official sheep disease name, which is why they aren’t correct.

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