Specific Response - An immune reaction that targets a specific pathogen using antibodies and memory cells., Antibody - A protein made by plasma cells that binds to and helps destroy a specific pathogen., Antigen - A substance (usually on the surface of a pathogen) that triggers an immune response., B Cell - A type of white blood cell that differentiates into plasma cells and memory cells when activated, Plasma - A type of white blood cell that makes antibodies., Memory cell - A long-living immune cell that remembers a specific pathogen for faster response if re-infected, Vaccination - An injection of a harmless form of a pathogen to stimulate immunity., Booster Injection - A second or later dose of a vaccine to ‘remind’ the immune system, Active Immunity - Immunity that results from the body producing its own antibodies., Passive Immunity - Immunity developed after being exposed to an infection or vaccine/an antigen, Natural Immunity - Immunity that occurs through environmental exposure (e.g., getting sick and recovering)., Artificial Immunity - Immunity gained through medical intervention (e.g., vaccines or antibody injections)., Herd Immunity  - When enough people in a group or area have achieved immunity (protection) against a virus or other infectious agent to make it very difficult for the infection to spread,

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