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Bovine leukemia virus (BLV) is a deltaretrovirus that infects and induces accumulation of B-lymphocytes in the peripheral blood and lymphoid tissues of cattle, leading to leukemia/lymphoma. BLV can also be experimentally transmitted to sheep, in which disease appears earlier and at higher frequencies. Abnormal accumulation of leukemic B-lymphocytes results from an alteration of different parameters that include cell proliferation and death as well as migration to lymphoid tissues. Interestingly, B lymphocyte turnover is increased in BLV-infected sheep but reduced in cattle, revealing a potential relationship between cell kinetics and disease progression.
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http://dx.doi.org/10.1016/j.vetimm.2008.04.007 | DOI Listing |
Biotechnol Prog
September 2025
Viral Clearance Study Department, Biosafety Testing (Suzhou), WuXi Biologics, Suzhou, Jiangsu, China.
The urgent need to replace the European-prohibited Triton X-100 in biomanufacturing has been hindered by insufficient data on alternative detergents' minimum effective concentrations (MECs) and process robustness in viral inactivation. This study makes systematic research including: (1) Establishment of MECs for novel Triton X-100 substitutes (TXR-1/VIS/13-S9/C16) achieving effective inactivation of Xenotropic murine leukemia virus and Pseudorabies virus (log reduction factor >4) across diverse CHO harvest fluids; (2) Demonstration of broad-spectrum efficacy against various viruses, with TXR-1/VIS/13-S9 maintaining effective inactivation for Bovine viral diarrhea virus, Vesicular stomatitis virus, Baculovirus, and Herpes simplex virus type 1; (3) Identification of PS20's material-dependent inactivation dynamics, establishing standalone parameters (4 h at 37°C) that achieve equivalent viral inactivation to traditional tri(n-butyl)phosphate -combined methods without requiring lipase activity-a paradigm shift in detergent application. Crucially, process optimization revealed that extending exposure time (1-4 h) enhanced PS20/PS80 efficacy more effectively than two fold concentration increases, providing cost-effective solutions.
View Article and Find Full Text PDFJ Dairy Sci
August 2025
Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI. Electronic address:
Streptococcus uberis is a common mastitis pathogen that lacks an effective vaccine in the United States and often requires antibiotic therapy. Supplementation of feed with Saccharomyces cerevisiae fermentation products (SCFP) has been associated with decreased SCC in dairy cows. The objective of this randomized clinical trial was to evaluate the effect of oral supplementation with SCFP on clinical and production outcomes in lactating dairy cows in response to intramammary challenge with Streptococcus uberis.
View Article and Find Full Text PDFInfect Agent Cancer
August 2025
Medical Microbiology and Immunology Department, Faculty of Medicine, Alexandria University, 0 Khartoum square, Azarita Medical campus, Alexandria, 21131, Egypt.
J Appl Genet
August 2025
Department of Veterinary Medicine, Santa Catarina State University (UDESC), Lages, Brazil.
Enzootic bovine leukosis (EBL) caused by the bovine leukosis virus (BLV) disturbs the immune response in bovines, leading to severe economic losses, with a possible impact on public health. EBL has no treatment or vaccine available, making the identification of genetic polymorphisms related to BLV resistance in locally adapted breeds like Crioula Lageana cattle valuable perspectives. This study aims to determine the presence of the BoLA-DRB3 alleles associated with susceptibility or resistance to BLV in Crioula Lageana cattle.
View Article and Find Full Text PDFJ Vet Diagn Invest
August 2025
Athens Veterinary Diagnostic Laboratory, Department of Pathology, College of Veterinary Medicine, University of Georgia, GA, USA.
Bovine leukemia virus-associated lymphoma (BLV-AL) is a significant neoplastic disease in cattle globally, resulting in substantial economic losses. Here we describe the anatomic distribution of lymphoma in adult cattle in 3 veterinary diagnostic laboratories (VDLs). Between 2001 and 2024, we retrieved 5,290 reports of bovine autopsies performed by these VDLs and 2,200 autopsies submitted by field veterinarians for diagnosis.
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