A preparation from the cowpox virus that protects against smallpox when administered to an individual, The virus of vaccinia used in vaccination, immunology A substance given to stimulate the body's production of antibodies and provide immunity against a disease, prepared from the agent that causes the disease, or a synthetic substitute

The branch of biomedicine concerned with the structure and function of the immune system, innate and acquired immunity, the bodily distinction of self from nonself, and laboratory techniques involving the interaction of antigens with specific antibodies, The branch of medicine that studies the body's immune system

(immunology) the attraction between an antigen and an antibody