The original meaning of vaccination was the infection with vaccinia (cow-pox) virus to confer immunity to smallpox, a practice introduced in 1796 by Edward Jenner.4

In 2014 the NIS schedules a child to receive 39 vaccine strain viruses and bacteria over 15 injections by the time they are 12 years old. The oral rotavirus vaccine RotaTeq will be added as of July 1st, bringing the total up to 42 vaccine strain viruses and bacteria. Several of these will also have bacterial toxoids and proteins added as adjuvants to enhance the immune response.

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