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West Nile virus (WNV) is a flavivirus that swept rapidly across North America in 1999, declined in prevalence, and then resurged in 2012. To date, no vaccine is available to prevent infection in the human population. Herpes simplex virus (HSV) replication-defective vaccine vectors induce a durable immunity characterized by strong antibody and CD8+ T cell responses even in HSV-immune animals. In this...
West Nile virus (WNV) is a mosquito-borne pathogen. During replication, WNV acquires different carbohydrates and lipid membranes, depending on its mosquito or vertebrate hosts. Consequently, WNV derived from mosquito and vertebrate cell lines differ in their infectivity for dendritic cells (DCs) and induction of type I interferon (IFN-α/β) in vitro. We evaluated the pathogenesis of WNV derived from...
West Nile virus (WNV) is a mosquito-borne flavivirus that infects the central nervous system of humans and other animals. In this study, we found that C3H/HeN (C3H) mice exhibited a higher morbidity and mortality than C57BL/6 (B6) mice. We compared tissue tropism, viral replication and kinetics for C3H and B6 mice during acute viral infection. WNV was detected in multiple tissues, including novel...
An adaptive mutation (E249G) within West Nile virus (WNV) NS4B gene was consistently recovered from replicon RNAs in C3H/He mouse cells. The E249G is located at the C-terminal tail of NS4B predicted to be on the cytoplasmic side of the endoplasmic reticulum membrane. The E249G substitution reduced replicon RNA synthesis. Compared with the wild-type NS4B, the E249G mutant protein exhibited a similar...
The arbovirus, Venezuelan equine encephalitis virus (VEE), causes disease in humans and equines during periodic outbreaks. A murine model, which closely mimics the encephalitic form of the disease, was used to study mechanisms of attenuation. Molecularly cloned VEE viruses were used: a virulent, epizootic, parental virus and eight site-specific glycoprotein mutants derived from the parental virus...
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