A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease. The effectiveness of vaccines has been widely studied and verified
The administration of vaccines is called vaccination. Vaccination is the most effective method of preventing infectious diseases;[8] widespread immunity due to vaccination is largely responsible for the worldwide eradication of smallpox and the restriction of diseases such as polio, measles, and tetanus from much of the world. The World Health Organization (WHO) reports that licensed vaccines are currently available for twenty-five different preventable infections.
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