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Viral antigens are components of viral structural proteins that can be specifically recognized by the host immune system and induce immune responses. They mainly include viral surface proteins (such as spike protein, hemagglutinin, and envelope protein) and internal proteins (such as nucleoprotein and capsid protein). As the bridge between viruses and their hosts, viral antigens play a critical role in viral entry, replication, and transmission, while serving as the primary targets for the body to generate protective immune responses.

Viral antigens are core reagents in infectious disease research and biopharmaceutical development. In vaccine development, recombinant viral antigens are widely used to design subunit vaccines and virus-like particle vaccines. In diagnostics, viral antigens are key components of immunoassay kits, enabling the development of ELISA and lateral flow assays for rapid screening of viral infections. Furthermore, viral antigens are extensively applied in antibody screening, antiviral drug development, and quality controls in serological assays. With high purity and rigorous quality control standards, recombinant viral antigens have become indispensable tools in infectious disease research.