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Section 1. Active and Passive Immunization

Active Immunization

Active immunization involves administration of all or part of a microorganism or a modified product of that microorganism (eg, a toxoid, a purified antigen, or an antigen produced by genetic engineering) to evoke an immunologic response that mimics that of natural infection but that usually presents little or no risk to the recipient. Immunization can result in antitoxin, antiadherence, anti-invasive, or neutralizing activity or other types of protective humoral or cellular responses in the recipient. Some immunizing agents provide nearly complete and lifelong protection against disease, some provide partial protection, and some must be readministered at regular intervals to maintain protection. The effectiveness of a vaccine is assessed . . . [Go to Full Text]


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