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dc.contributor.author | Odendaal, Lieza![]() |
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dc.contributor.author | Davis, A. Sally![]() |
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dc.contributor.author | Fosgate, Geoffrey Theodore![]() |
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dc.contributor.author | Clift, Sarah Jane![]() |
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dc.date.accessioned | 2020-02-19T05:03:19Z | |
dc.date.available | 2020-02-19T05:03:19Z | |
dc.date.issued | 2020-01 | |
dc.description.abstract | A clear distinction can be made regarding the susceptibility to and the severity of lesions in young lambs when compared to adult sheep. In particular, there are important differences in the lesions and tropism of Rift Valley fever virus (RVFV) in the liver, kidneys, and lymphoid tissues of young lambs. A total of 84 lambs (<6 weeks old), necropsied during the 2010 to 2011 Rift Valley fever (RVF) outbreak in South Africa, were examined by histopathology and immunohistochemistry (IHC). Of the 84 lambs, 71 were positive for RVFV. The most striking diagnostic feature in infected lambs was diffuse necrotizing hepatitis with multifocal liquefactive hepatic necrosis (primary foci) against a background of diffuse hepatocellular death. Lymphocytolysis was present in all lymphoid organs except for the thymus. Lesions in the kidney rarely progressed beyond hydropic change and occasional pyknosis or karyolysis in renal tubular epithelial cells. Viral antigen was diffusely present in the cytoplasm of hepatocytes, but this labeling was noticeably sparse in primary foci. Immunolabeling for RVFV in young lambs was also detected in macrophages, vascular smooth muscle cells, adrenocortical epithelial cells, renal tubular epithelial cells, renal perimacular cells, and cardiomyocytes. RVFV immunolabeling was also often present in capillaries and small blood vessels either as non-cell-associated viral antigen, as antigen in endothelial cells, or intravascular cellular debris. Specimens from the liver, spleen, kidney, and lungs were adequate to confirm a diagnosis of RVF. Characteristic lesions were present in these organs with the liver and spleen being the most consistently positive for RVFV by IHC. | en_ZA |
dc.description.department | Paraclinical Sciences | en_ZA |
dc.description.department | Production Animal Studies | en_ZA |
dc.description.librarian | am2020 | en_ZA |
dc.description.sponsorship | The Institutional Research Theme, Biotechnology and the Management of Animal and Zoonotic Diseases, of the University of Pretoria and the Agricultural Sector Education Training Authority, South Africa. Publication of this study was funded by the Department of Paraclinical Sciences of the Faculty of Veterinary Science, University of Pretoria and the Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, of Kansas State University. | en_ZA |
dc.description.uri | http://journals.sagepub.com/home/vet | en_ZA |
dc.identifier.citation | Odendaal, L., Davis, A.S., Fosgate, G.T. et al. 2020, 'Lesions and cellular tropism of natural Rift Valley fever virus infection in young lambs', Veterinary Pathology, vol. 57, no. 1, pp. 66-81. | en_ZA |
dc.identifier.issn | 0300-9858 (print) | |
dc.identifier.issn | 1544-2217 (online) | |
dc.identifier.other | 10.1177/0300985819882633 | |
dc.identifier.uri | http://hdl.handle.net/2263/73411 | |
dc.language.iso | en | en_ZA |
dc.publisher | Sage | en_ZA |
dc.rights | © The Author(s) 2019 | en_ZA |
dc.subject | Pathology | en_ZA |
dc.subject | Tissue tropism | en_ZA |
dc.subject | Bunyaviruses | en_ZA |
dc.subject | Viral hemorrhagic fevers | en_ZA |
dc.subject | Zoonotic disease | en_ZA |
dc.subject | Rift Valley fever virus (RVFV) | en_ZA |
dc.subject | Lambs | en_ZA |
dc.subject | Immunohistochemistry (IHC) | en_ZA |
dc.subject | Histopathology | en_ZA |
dc.title | Lesions and cellular tropism of natural Rift Valley fever virus infection in young lambs | en_ZA |
dc.type | Postprint Article | en_ZA |