S antigen

The S antigen is a specific protein found on the surface of the spike protein of certain viruses, such as coronaviruses like SARS-CoV-2. This spike protein enables the virus to attach to and enter human cells. The S antigen is important in understanding how the virus infects hosts and is often targeted by vaccines and diagnostic tests. Detecting or using the S antigen helps researchers develop treatments and monitor immune responses, playing a key role in controlling viral infections and preventing disease spread.