Definition for Vaccination
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Revision as of 12:00, 26 January 2011 by Bio man (Talk | contribs) (Created page with "The injection into the body of small quantities of living or dead microbes, small quantities of toxins, or harmless antigenic molecules derived from a microorganism or its toxin,...")
The injection into the body of small quantities of living or dead microbes, small quantities of toxins, or harmless antigenic molecules derived from a microorganism or its toxin, resulting in a primary immune response including the production of memory cells. Subsequent natural exposure to the immunizing antigen results in a response that can prevent or reduce the severity of disease.
