Immunology is the investigation of all parts of the immune system in all life forms. It manages the physiological working of the immune system in conditions of both wellbeing and disease; glitches of the immune system in immunological scatters (autoimmune diseases, hypersensitivities, immune inadequacy, transplant dismissal); the physical, substance and physiological qualities of the parts of the immune system in vitro, in situ, and in vivo. Infections are firmly immunogenic and prompts 2 sorts of immune reactions; humoral and cell. The collection of specificities of T and B cells are framed by revisions and substantial transformations. T and B cells don't for the most part perceive similar epitopes present on a similar infection. B cells see the free unaltered proteins in their local 3-D adaptation though T cells for the most part observe the Ag in a denatured structure related to MHC particles. The qualities of the immune response to a similar infection may vary in various people contingent upon their hereditary constitutions.