Results 221 to 230 of about 7,818 (252)

Visna virus RNA synthesis

Journal of Virology, 1977
Visna is a classical slow infection in which virus characteristically persists in the face of the host immune response. The agent of this disease belongs to the retravirus group. The persistence of infection and the slow spread of virus are at least in part a consequence of restriction of the expression of virus genetic information in tissues of an ...
R Vigne, Ashley T. Haase, P Filippi, Michel Brahic   +3 more
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Goat visna virus: Isolation of a retrovirus related to visna virus of sheep

Archives of Virology, 1981
Choroid 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 bei der Ziege

Zentralblatt für Veterinärmedizin Reihe B, 2010
Zusammenfassung Es wurden 19 Ziegen untersucht, die aus einer Herde stamniten, in der die fur Visna des Schafes typischen zentralnervosen Storungen und pathologischhistologischen Veranderungen vorkamen. Bei der klinischen Untersuchung hatten die Ziegen Visna-Symptome wie zentralnervosbedingte Storungen mit Paresen und Paralysen, in der Nachhand ...
B. Triemer, E. Weingold
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Antigenic variation in visna virus

Cell, 1979
Two antigenic variants of visna virus were isolated sequentially from a single sheep inoculated with a plaque-purified strain of virus designated 1514. The genetically stable variants, LV1-1 and LV1-4, are of two classes: LV1-1 is partially neutralized by antibody to the inoculum strain 1514, while LV1-4 is not neutralized by antibody to 1514.
Jane V. Scott, Opendra Narayan, Linda Stowring, Ashley T. Haase, Robert Vigne   +4 more
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Visna in Sheep

1979
In 1935 the first cases of a previously unknown paralytic disease were seen in older age-groups of sheep in a south-western region of Iceland (Fig l). From 1935-1952 cases were increasing causing considerable loss of sheep in the affected flocks (l, 2, 3).
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An ultrastructural study of the cerebrospinal fluid in visna

Acta Neuropathologica, 1979
An electron microscopic examination was done on 8 samples of cerebrospinal fluid (CSF) from Icelandic sheep infected by the intracerebral route with visna virus. The specimens were collected 1 month, 2 months, and 4 years after infection. A differentail cell count done on low-power electron micrographs showed that the cellular exudate was composed of ...
Gudmundur Georgsson, Gudmundur Georgsson, Neal Nathanson, Neal Nathanson, G. Pétursson, G. Pétursson, J.R. Martin, J.R. Martin, E Benediktsdóttir, E Benediktsdóttir, Páll A. Pálsson, Páll A. Pálsson   +11 more
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Infectivity of visna virus DNA

Virology, 1976
Abstract Deoxyribonucleic acid isolated from cells infected with the RNA containing slow virus visna confers on uninfected cells the capacity to synthesize new virus. The cytopathic agent isolated in these experiments has the biological and biochemical properties of visna virus, and the active material is DNA by several criteria, the most important ...
Ashley T. Haase, Ashley T. Haase, David W. Alling, Peter E. Ventura, Peter E. Ventura, Betty L. Traynor, Betty L. Traynor   +6 more
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Experimental visna in foetal Icelandic sheep

Journal of Comparative Pathology, 1978
Abstract 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 ...
Gudmundur Georgsson, Gudmundur Georgsson, G. Pétursson, G. Pétursson, Neal Nathanson, Neal Nathanson, Páll A. Pálsson, Páll A. Pálsson, A. Miller, A. Miller   +9 more
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The occurrence of maedi-visna virus in Lebanon

Revue Scientifique et Technique de l'OIE, 2017
Maedi-visna (MV) is a chronic viral disease prevalent in adult sheep that is caused by a virus belonging to the small ruminant lentivirus group (SRLV). This disease is considered to affect the international trade of sheep and is classified in the World Organisation for Animal Health (OIE) list of notifiable animal diseases.
Tabet, E., Tlaige, R., El Hage, Jeanne, Abi Rizk, Alain   +3 more
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Ultrastructural studies on Maedi-Visna virus

Archives of Virology, 1980
Ultrastructural studies of Maedi-Visna virus (MVV) particles isolated from tissue culture fluids of MVV-infected cells as well as cultured cells infected with MVV were performed. MVV particles aree bounded by an envelope with projections loosely attached to its surface.
M. Bruns, F. Weiland
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