From ArticleWorld

Vaccination is a process of administering a dead or very attenuated virus to a patient in order to offer him immunity against this type of virus. Edward Jenner is the first person which used the term and Louis Pasteur adopted it and included it his work on vaccination. The first vaccine was obtained from a virus affecting cows. It offered small immunity against smallpox. With the last case seen in 1977, the elimination of smallpox is considered the greatest success of vaccination.

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