Learn about the immune system and the diseases that threaten it. Investigate the arsenal of defenses your body uses to keep you healthy. See these cells in action as we identify the types of cells involved in an immune response and how an innate response differs from an acquired response. Using biochemical techniques such as Enzyme-Linked Immunosorbent Assay (ELISA), we’ll see how scientists can detect the presence of antibodies and antigens in biological samples. Find out about “Disease Hunters,” doctors turned detectives who track diseases through the microscopic world of deception and intrigue.