Natural cases of visna in sheep with myelitis as the sole lesion in the central nervous system

Journal of Comparative Pathology
J BenavidesV Pérez

Abstract

Of 118 sheep with visna, 12 showed myelitis as the only nervous lesion. They were ovine lentivirus (OvLV)-seropositive and provirus DNA was demonstrated by LTR-PCR in all the samples with lesions. Clinically, all showed hindlimb paralysis and some were completely recumbent. Grossly, a swollen and discoloured area was identified in the white matter in 10 sheep. Microscopical changes consisted of a wedge-shaped area of non-suppurative leucomyelitis with mononuclear perivascular cuffing, demyelination and white matter degeneration. Except for two samples, grey matter was affected adjacent to severe white matter lesions. Three different microscopical patterns of lesion were identified, all having in common the presence of perivascular inflammation: the so-called vascular pattern was characterized by perivascular cuffs with minimal lesions in the adjacent neuroparenchyma; the malacic pattern, which was the commonest type, was characterized by severe white matter destruction and small numbers of macrophages; and the infiltrative pattern was characterized by a severe infiltrate of histiocytes in the parenchyma. Maedi-visna virus antigen was detected immunohistochemically only in areas with lesions, and the degree of immunolabelling wa...Continue Reading

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Citations

May 18, 2012·Veterinary Research·Helena CrespoRamsés Reina
Jan 28, 2012·BMC Veterinary Research·Hugo RamírezDamián de Andrés
Jul 25, 2013·Viruses·Juliano Cezar Minardi da CruzYahia Chebloune
Oct 22, 2013·The Journal of Veterinary Medical Science·Keisuke OgumaHiroshi Sentsui
Oct 18, 2011·Journal of Comparative Pathology·L PolledoJ F García Marín
Oct 17, 2008·Journal of Comparative Pathology·J BenavidesV Pérez
Sep 29, 2015·Veterinary Sciences·Deepanwita BoseYahia Chebloune

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