The adaptive immune response enables the

Position 1: Vaccination exploits this mechanism by introducing a harmless antigen, thereby establishing immunological memory without exposing the individual to the risks of active disease.

Position 2: Upon first exposure to a foreign antigen, B lymphocytes differentiate into plasma cells that secrete antibodies precisely shaped to bind that antigen.

Position 3: When the same pathogen is detected on a subsequent occasion, these memory cells proliferate rapidly and produce antibodies far more quickly than the primary response allowed.

Position 4: The adaptive immune response enables the body to mount a highly specific defence against pathogens it has encountered previously.

Position 5: A subset of these B cells persists in the body as long-lived memory cells long after the initial infection has been cleared.