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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 mimicking 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 response in the recipient. Some immunizing agents provide nearly complete lifelong protection against disease, some provide partial protection,
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