In this experiment, indirect enzymelinked immunosorbent assay(IELlSA), immunohistochemistry staining, histochemistry staining, scanning electron microscope(SEM), transmission electron microscope(TEM) were used to discover the changes and mechanism of the Igs in local humor-tear, trachea fluid, bile, intestinal fluid; the changes and mechanism of both IgS+ antibody-producing cells and T cells in local immune tissues-cecal tonsils, gland of Harder, Peyer's patch of the chicks after administration ...