One of the major contributors to our understanding of vaccination was edward jenner. what is jenner’s contribution to the development of vaccinations?

Edward Jenner discovered the vaccine for the small pox.

Explanation:  Edward Jenner was an English country doctor. Small pox was a killer before his discovery of the vaccination. It was the first successful vaccine ever developed.  He carried his experiment on James Phipps, by inserting pus of a cowpox pustule into an incision on the boy's arm. And proved that it can provide immunity from small pox.

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