This is an introductory course which surveys most areas of immunology. Immunology is the study of how higher organisms deal with infectious agents. The course is designed to provide a basic understanding of molecular mechanisms underlying the development of the immune response. Topics will include molecular mechanisms of innate immunity, the structure of antibodies and T cell receptors, antigen- antibody interactions, the major histocompatibility complex, antigen presentation, generation of antibody diversity, signaling through immune system receptors, the molecular basis of immune attack, immunological tolerance, and immune memory. There will be topics from medical or bench-side immunology in last few weeks, depends on the conditions and time availability.