Used in diagnostic assays to detect the presence of viral nucleocapsid proteins, particularly in immunoassays such as ELISA and lateral flow tests. Commonly applied in research and clinical settings to study viral infections, including coronaviruses, by targeting the nucleocapsid antigen. Also utilized in immunohistochemistry and Western blotting for specific detection of viral particles in cell cultures and patient samples. Supports development and validation of rapid test kits due to its high specificity for nucleocapsid antigens.