Vaccination
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Vaccination is the injection of a killed or weakened infectious organism in order to prevent the disease.[1] In the United States and throughout the modern world, parents routinely get their children vaccinated to ward off measles and several other diseases which most people in the 21st century have never heard of.
In rare cases, vaccinations have side effects; so, some new and untested vaccinations are unpopular, and controversies have developed over whether the government has the right to vaccinate schoolchildren against the parents' wishes.