<prompt> Antigen antibody reaction is detected by -a ELISAb Southern Blot c Northern Blotd Western Blot e Eestern Blotbcadab  <response>: Antigen-antibody reactions are detected by- Precipitationflocculation tests, agglutination tests, neutralization tests, complement fixation tests CFT, western blotting immunoblotting, ELISA, and radioimmunoassay RIA. 