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immunology idiotypic antibody allotypic antibody isotypic antibody types of antibody antibody herd immunity acquired immunity innate immunity artificial immunity natural immunity types of immunity secondary lymphoid organs secondary immune organs primary lymphoid organs primary immune organs lymphoid organs immune organs history history of immunology immune system cells cells of immune system allergen test elisa clia rocket electro-immunodiffusion ria rid odd flocculation reactions precipitation reactions agglutination factors influencing immunogenicity chemical nature of antigen immunogen properties of antigen types of antigen antigen on the basis of origin types antigen igm ige igd igg iga