This course aims for understanding and covering the mechanisms of the immune system with special focus on antigen antibody structure and function, cells and tissues of immune system, lymphocyte activation and specificity; effector mechanisms; complements, major histocompatibility complexes, B- and T-cell receptors, also provides a complete background to the functions of innate and adaptive immunity (cellular and humoral), genetics of immune system, vaccines, autoimmunity, hypersensitivity, focusing on some basic techniques used in Immunology.