Antigen

Antigen refers to a molecule or molecular structure capable of being recognised by the immune system, specifically by antibodies or immune cell receptors, thereby triggering an immune response. Antigens may originate from pathogens such as viruses and bacteria, or from abnormal cells such as tumour cells, making them central to vaccine development and immunotherapy strategies. In biopharmaceutical contexts, antigens are often proteins, peptides, or polysaccharides designed or selected to induce protective immunity or guide targeted immune activation.

The biopharmaceutical industry leverages antigen science to develop vaccines, diagnostic assays, and targeted therapeutics that address infectious diseases, cancer, and autoimmune disorders. Antigen selection requires careful consideration of immunogenicity, epitope stability, and cross-reactivity risks that may influence safety and efficacy outcomes. Manufacturers must ensure consistent antigen production, purity, and structural integrity through robust upstream and downstream processing controls. As next generation vaccine platforms expand, including recombinant and nucleic acid-based approaches, antigen engineering and characterisation remain essential to improving immune response durability and supporting scalable, high quality manufacturing.