Immunology the branch of life sciences deals with physiology of immune system in disease and infection. The central science of immunology, Deals with functioning and interaction of immune system with the foreign particle. The traditional approach to immunology takes into account the association between immunity, pathogens, and medicine. Immunology alone is the study of response of an organism to antigenic challenge and its recognition of “self”.
Classical immunology deals with the relationship between the body systems, pathogens, and immunity. The immune system is composed of the orchestrated activities of many cell types designed to protect the host from microbes, toxins, and tumour formation.