Edward Jenner, English physician and microbiologist (died 1823)

Edward Jenner was an English physician and scientist who pioneered the concept of vaccines and created the smallpox vaccine, the world's first vaccine. The terms vaccine and vaccination are derived from Variolae vaccinae, the term devised by Jenner to denote cowpox. He used it in 1798 in the title of his Inquiry into the Variolae vaccinae known as the Cow Pox, in which he described the protective effect of cowpox against smallpox.

May 17 is the 137th day of the year in the Gregorian calendar; 228 days remain until the end of the year.