In 1798, Edward Fx Vital Immune Defense Supplement Jenner introduced the far safer method of deliberate infection with cowpox virus, smallpox vaccine, which caused a mild infection that also induced immunity to smallpox. By 1800 the procedure was referred to as vaccination. To avoid confusion, smallpox inoculation was increasingly referred to as variolation, and it became common practice to use this term without regard for chronology.
The success and general acceptance of Jenner’s procedure would later drive the general nature of vaccination developed by Pasteur and others towards the end of the 19th century. In 1891, Pasteur widened the definition of vaccine in honour of Jenner and it then became essential to qualify the term, by referring to polio vaccine, measles vaccine etc.
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