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Seneca Valley virus (SVV) is a type of small RNA virus that is not pathogenic to normal human cells, but has strong oncolytic activity in tumor cells. SVV has been found to be the primary pathogen of swine vesicular disease. In recent years, SVV outbreaks have been continuously reported, as well as in the United States, Brazil, and other places, causing serious economic losses. Due to the characteristics of recombinant mutations and increased pathogenicity of SVV, there is currently no commercially available vaccine available, which poses a serious challenge to the prevention and control of the disease. Therefore, it is urgent to clarify its pathogenic and immune mechanisms to provide scientific basis for the prevention and control of this disease.
The total length of the SVA genome is approximately 7300nt, consisting of a 6543nt open reading frame, a 668nt 5 'non coding region, and a 68nt 3' non coding region with a poly (A) tail. The SVA virus particle is an icosahedral structure, small and nearly circular in shape, with a diameter of approximately 17-25 nm. The SVA virus genome consists of a long 5 'end non coding region, a single open reading frame (ORF), and a short 3' end non coding region from beginning to end. The 5 'non coding region contains genome associated protein (VPg) sequences and internal entry sites of type IV ribosomes. VPg proteins are covalently linked to the 5' non coding region and can participate in the translation of viral RNA by binding to initiation factors during viral proliferation. The internal entry sites can recruit ribosomes to translate viral RNA.
Figure 1. Structure of Seneca Valley Virus. (Cao, Lin,et al, 2018)
| Target Type | Host Gene / Protein / Pathway | Viral Factor / Mechanism | Pathological Consequence |
| Innate Immune Signaling | Type I Interferon (IFN-I) Pathway | 3Cpro cleaves multiple adaptor proteins (MAVS, TRIF, TANK) to block IFN production. It also degrades transcription factors IRF3 and IRF7. | Suppresses the host's primary antiviral alarm system, allowing unchecked viral replication. |
| JAK-STAT Signaling | 3Cpro targets the STAT1-STAT2-IRF9 complex and karyopherin KPNA1 to inhibit IFN signaling transduction. | Preects infected cells from establishing an antiviral state, even if IFN is produced. | |
| Viral Entry Factors | ANTXR1 | The cellular receptor ANTXR1 (anthrax toxin receptor 1) is an essential entry factor for SVV. | Mediates viral attachment and entry into porcine cells. Genetic disruption of ANTXR1 confers resistance to infection. |
Seneca Valley virus infection causes vesicular disease that is indistinguishable from the clinical signs of FMD, swine vesicular disease, vesicular stomatitis, or vesicular exanthema. The clinical signs in SVV-infected pigs include fluid-filled and ruptured vesicles or ulcerative lesions on the snouts and coronary bands, lameness, anorexia, lethargy, cutaneous hyperemia, and fever. The affected adult pigs often present with difficulty in moving, decreased feed intake, and daily weight gain. The viremia period lasts approximately 7 days, and the clinical signs may persist for 2–14 days.
Seneca Valley Virus cannot be clearly distinguished from other swine infectious vesicular diseases such as foot-and-mouth disease (FMD), swine vesicular disease (SVD), vesicular stomatitis (VS), and vesicular rash (VES) in terms of disease characteristics and clinical symptoms. Therefore, some diagnostic methods are needed to confirm the diagnosis.
| Diagnosis | Details |
| Pathogenic Testing | Virus isolation is the most effective and accurate method for identifying and diagnosing this disease. Firstly, samples of blister fluid and diseased skin tissue from diseased pigs are collected, and high titers of SVA are cultured and isolated using human lung cancer monolayer cell lines or pig kidney cell lines. Then use an electron microscope to observe and confirm the diagnosis. |
| PCR Detection | SVA is detected using conventional PCR or fluorescence quantitative PCR (RT-PCR). This method is simple, fast, has better repeatability, higher sensitivity, and strong specificity. Real time quantitative RT-RCR is the preferred method for detecting SVA. |
| Serological Testing | Compared with pathogen testing, serological testing is relatively simple to operate, cost-effective, and has good accuracy and sensitivity. Moreover, it does not require the use of electron microscopes, making it very suitable for large-scale disease detection and epidemic monitoring. There are many serological diagnostic methods, among which virus neutralization test and enzyme-linked immunosorbent assay are the most commonly used. |
The Seneca Valley virus has rapidly become a global concern in the pig farming industry. The characteristic of its pathogenesis is the ruthless attack on the host's innate immune system planned by multifunctional 3C proteases. SVV effectively silenced type I interferon response by cleaving key host proteins such as HDAC4, MAVS/TRIF/TANK, and IRF3/7. The identification of ANTXR1 as a key entry receptor has opened up new avenues for understanding tissue tropism and developing resistant animals. Although inactivated vaccines provide a practical tool for disease control, a deeper understanding of the interaction between the virus and the host, particularly the mechanism of 3C protease, is crucial for developing the next generation of antiviral drugs and stronger control strategies against this economically harmful pathogen.
Reference
| Target | Cat. No. | Product Name | Host | |
| SVA | DAG-WT1130 | Inactivated Seneca Valley virus (SVV) | N/A | Inquiry |
| DAG-WT5853 | Seneca Valley virus (SVV) Stock (Qualitative) | N/A | Inquiry |
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