Possible production of immunosuppression in the host by exposure to microorganisms: observations in germfree rats.
D000818:Animals; D003601:Cytotoxicity Tests, Immunologic; D004926:Escherichia coli; D005856:Germ-Free Life; D006084:Graft Rejection; D006386:Hemagglutination Tests; D007108:Immune Tolerance; D007112:Immunity, Maternally-Acquired; D007165:Immunosuppression Therapy; D051381:Rats; D016038:Skin Transplantation; D014181:Transplantation Immunology; D014183:Transplantation, Heterologous; D014184:Transplantation, Homologous