Used in research and diagnostic applications to detect the spike protein's receptor-binding domain (RBD) of SARS-CoV-2. Helps in studying virus neutralization mechanisms and evaluating immune responses in infected or vaccinated individuals. Employed in immunoassays like ELISA and Western blot for high specificity binding. Supports development of therapeutic antibodies and diagnostic kits by targeting epitopes involved in viral entry into host cells. Also utilized in biosensor platforms for rapid detection of viral antigens.