Explain how an individual develops immunity following infection by a bacteria

When an individual is exposed to the bacterial pathogen and its antigen, it causes activation of the body's own immune response. When the immune response is initiated, the pathogens are destroyed by T killer lymphocytes and antibodies are produced by B lymphocytes. The B lymphocytes stimulate the production of memory lymphocytes so when the individual is infected by the pathogen again, the body knows how to fight it off. This is known as the secondary immune response.