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|Noun||1.||immunizing agent - any substance or organism that provokes an immune response (produces immunity) when introduced into the body|
vaccine, vaccinum - immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies
toxin antitoxin - a mixture of toxin and antitoxin used to immunize against a disease
antigen - any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)