This article is from the Childhood Vaccinations FAQ, by Lynn Gazis-Sax lynng@alsirat.com with numerous contributions by others.
The basic principle of vaccination is that a disease-causing agent is
given to a person in a killed or weakened form (or in the form of
proteins genetically engineered to look like a disease-causing agent),
in order to stimulate the production of antibodies to fight off the
disease.
 
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