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1990
Visna virus was originally recognized in the 1930s as the etiologic agent of an unusual and sporadic outbreak of a transmissible neurologic disease that simultaneously appeared with several chronic pneumonic diseases affecting sheep in Iceland (Sigurdsson, 1954, 1957; Sigurdsson and Palsson, 1958). Visna means “wasting” in Icelandic and became the name
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Visna virus was originally recognized in the 1930s as the etiologic agent of an unusual and sporadic outbreak of a transmissible neurologic disease that simultaneously appeared with several chronic pneumonic diseases affecting sheep in Iceland (Sigurdsson, 1954, 1957; Sigurdsson and Palsson, 1958). Visna means “wasting” in Icelandic and became the name
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Experimental visna in foetal Icelandic sheep
Journal of Comparative Pathology, 1978Abstract Visna is a chronic neurological disease of sheep caused by a slow infection with a naturally occurring ovine retrovirus. The present study was focused on the influence of age on the pathogenesis of this infection and involved intrauterine inoculation of 7 sheep foetuses at about 90 days of gestation with slaughter at birth, 6 to 7 weeks ...
G, Georgsson +4 more
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The ultrastructure of early visna lesions
Acta Neuropathologica, 1977The ultrastructure of visna, a slowly progressive menigo-encephalomyelitis of sheep, was studied in animals sacrificed one month after intracerebral inoculation of visna virus. The major pathological changes, representative of those seen during the first year after infection, consist of inflammation and minor focal destructive lesions of grey and white
G, Georgsson +4 more
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Goat visna virus: Isolation of a retrovirus related to visna virus of sheep
Archives of Virology, 1981Choroid plexus (GCP-3) cell cultures were prepared from an adult goat with symptoms of visna. The GCP-3 cell layer had partly fused into large multinucleated giant cells and electronmicrographs showed virus particles morphologically indistinguishable from sheep visna virus (SVV).
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Visna Virus Infection of American Lambs
Science, 1974Random-bred fetal and 4-week-old American lambs, inoculated intracerebrally with visna virus, developed a persistent infection in the brain and sometimes in the lung. The pathologic changes present in these lambs were similar to the early lesions of visna in Icelandic sheep, thus providing a possible model for the study of virus-induced demyelinating ...
O, Narayan +3 more
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PHOTOINACTIVATION OF VISNA VIRUS
Acta Pathologica Microbiologica Scandinavica, 1964H, THORMAR, I, PETERSEN
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Maedi-Visna and Ovine Progressive Pneumonia
Veterinary Clinics of North America: Food Animal Practice, 1997Maedi-Visna and ovine progressive pneumonia are disease of sheep that are caused by ovine lentivirus and characterized by chronic inflammation of the lungs, mammary glands, joints, and central nervous system. Although tremendous progress in research has led to a better understanding of the pathogenesis of these diseases, many questions still remain ...
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