Vaccination

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Vaccination is the administration of antigenic material to stimulate the immune system of an individual to develop adaptive immunity to a disease. Vaccines can prevent or ameliorate the effects of infection by many pathogens. The efficacy of vaccination has been widely studied and verified; for example, the influenza vaccine, the HPV vaccine, and the chicken pox vaccine among others. In general, vaccination is considered to be the most effective method of preventing infectious diseases. The active agent of a vaccine may be intact but inactivated or attenuated forms of the causative pathogens, or purified components of the pathogen that have been found to be highly immunogenic. Toxoids are produced for the immunization against toxin-based diseases, such as the modification of tetanospasmin toxin of tetanus to remove its toxic effect but retain its immunogenic effect.
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