ArticleBrazilian journal of microbiology : [publication of the Brazilian Society for Microbiology]2022
An outbreak of visna-maedi in a flock of sheep in Southern Brazil.
Article in Brazilian journal of microbiology : [publication of the Brazilian Society for Microbiology], 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 7 citations in OpenAlex.
- Investigation of the Seroprevalence of Lentivirus ovivismae and Lentivirus capartenc (Formerly Known as Maedi-Visna and Caprine Arthritis-Encephalitis Virus) Infections in Sheep and Goats in the Yozgat Region.Veterinary medicine and science · 2026Article
- Ovine gammaherpesvirus-2 associated manifestations with concomitant polioencephalomalacia, bovine alphaherpesvirus 1-related pneumonia, and caseous lymphadenitis in a sheep.Brazilian journal of microbiology : [publication of the Brazilian Society for Microbiology] · 2025Article
- Molecular Characterization of Small Ruminant Lentiviruses in Sheep and Goats: A Systematic Review.Animals : an open access journal from MDPI · 2024Review
- The genetic variability of small-ruminant lentiviruses and its impact on tropism, the development of diagnostic tests and vaccines and the effectiveness of control programmes.Journal of veterinary research · 2023Article
- First Molecular Characterization of Small Ruminant Lentiviruses Detected in Romania.Animals : an open access journal from MDPI · 2023Article
- PCV3-associated reproductive failure in pig herds in Brazil.Tropical animal health and production · 2022Article
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Authors and funding
14 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Visna-maedi is a multisystemic and progressive inflammatory disease caused by a non-oncogenic retrovirus (Visna-maedi virus, VMV). An outbreak of visna-maedi occurred in Southern Brazil in sheep with clinical signs of blindness and stumbling gait. At post-mortem examination, all animals had similar lesions, including heavy non-collapsed lungs and multifocal yellow areas in the cerebral white matter, affecting mainly the periventricular region. These lesions corresponded histologically to lymphocytic interstitial pneumonia and histiocytic periventricular encephalitis surrounding areas of necrosis, in addition to significant demyelination in the brain. Serology was performed in all the sheep from the flock and 14% were seropositive for VMV. The presence of VMV was confirmed through PCR and partial sequencing of the 5'LTR. Sequencing demonstrated that the virus had 89.7 to 90.0% of nucleotide identity with VMV strains reported in the USA. This is the first description of clinical disease related to VMV in Brazil leading to economic losses. This study calls for the need to implement control measures to prevent the spread of small ruminant lentiviruses in Brazil.
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