The aim of this invention is to induce and maintain tolerance to specific antigens with IgA (Immunoglobulin A). It is theoretically likely that the major role of IgA is to induce and maintain tolerance because: it binds to epitopes(determinants) on the antigens it does not mount destruction nor elimination of antigens almost all antigens in the small intestine are not immunogens but tolerogens and it is more important to induce tolerance rather than to stimulate immune responses in the small intestine. In other words, IgA is the inhibitor that suppresses IgM-, IgG- and IgE-mediated immune responses. Therefore, In order to induce tolerance to an antigen, it is theoretically effective to administrate the antigen and immunoglobulin A antibodies that are binding to the epitopes of the antigen.
