An introducction to immunobiology and immunity: Basic concepts in immunology. Innate immunity: the first lines of defense. The induced responses of innate immunity. The recognition of antigen: Antigen recognition by B-cell and T-cell receptors. The reneration of lymphocyte antigen receptors. Antigen presentation to L lymphocytes. The development of mature lymphocyte receptor repertoires: Signaling through immune-system receptors. The development and survival of lymphocytes. The adaptive ammune response: T cell-mediated immunity. The humoral immune response. Dynamics of adaptive immunity. The mucosal immune system. The immune system in health and disease: Failures of host defense mechanisms. Allery and allergic diseases. Autoimmunity and transplantation. Manipulation of the immune response. Appendix I: Immunologist´s toolbox with immunological constants. Appendix II CD antigens. Appendix III: Cytokines and their receptors. Appendix IV: Chemokines and their receptors