pages matching 'cowpox'
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British scientist Edward Jenner was among the first people to develop the vaccine. In the late 17th Century, Jenner successfully prevented smallpox infection in several of his test subjects by ...
updated 2010-07-17 04:12:28
Vaccines are preparations intended to immunize an organism against a disease of some form. Vaccines are mostly preventative, but some are intended to provide additional resistance to an existing condition.