An Inquiry Into the Causes and Effects of the Variolæ Vaccinæ, Or Cow-Pox, by Edward Jenner
Edward Jenner found that disease in the heel of a horse, transmitted through a cow to the dairy attendants, was an agent in making human beings immune from smallpox. His amazing experiments inaugurated a new epoch. (Volume 38, Harvard Classics)
Edward Jenner makes his first vaccination May 14, 1796.
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