This course is aimed to provide the element knowledge  of  immunology. It contains basic and essential information on the evolution of the immune system in vertebrates, innate and adaptive immunology, cells and organs of the immune system, innate and adaptive immune mechanisms, antigen and antibodies, antigen-Antibody reactions,  introduction to immune deficiencies, introduction to hypersensitivity reactions (with comprehensive description on Type 2), active and passive immunity, vaccination, herd immunity and many more