Observation and deductive reasoning. Smallpox was a scourge during Jenner's time, but he noticed that milkmaids contracted a very mild illness similar to smallpox called "cowpox", from which they recovered easily. He postulated that a tiny bit of the cowpox serum could be injected into a well person, and the mild cowpox might protect them from the deadly smallpox. It worked.
Edward Jenner developed a vaccine for smallpox in the early 1700s.
In 1796, Dr. Edward Jenner discovered the first vaccination for smallpox, trying to save his one month old son.
Smallpox. He found that if you had cowpox BEFORE smallpox, you would be immune to smallpox for the remainder of your life.
Small Pox
Smallpox
small pox
Dr Edward Jenner's qualification is that he found a vaccination for the deadly disease smallpox.
the smallpox vaccine.
Edward Jenner
yes it did work.
he was the discoverer of small-pox vaccination
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He discovered a vaccination for the smallpox
Edward Jenner performed the first smallpox vaccination and founded the science of immunology.
I think you mean Edward Jenner: Vaccination & antiseptics and all that....
by making a small pox vaccination
Edward Jenner
It was Edward Jenner.