Visna virus (also known as Visna-Maedi virus, Maedi-Visna virus and ovine lentivirus) from the genus lentivirinae and subfamily Orthoretrovirinae, is a "prototype" retrovirus that causes encephalitis and chronic pneumonitis in sheep. It is known as visna when found in the brain, and maedi when infecting the lungs. Lifelong, persistent infections in sheep occur in the lungs, lymph nodes, spleen, joints, central nervous system, and mammary glands; The condition is sometimes known as "ovine progressive pneumonia", particularly in the United States, or "Montana Sheep Disease". White blood cells of the monocyte/macrophage lineage are the main target of Visna virus.
Read more about Visna Virus: Viral Infection, Model System For HIV Infection, Control Programmes
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“If I knew for a certainty that a man was coming to my house with the conscious design of doing me good, I should run for my life ... for fear that I should get some of his good done to me,—some of its virus mingled with my blood.”
—Henry David Thoreau (1817–1862)