How Did Edward Jenner Replace Immunization Technique?

It was in late eighteenth century Edward Jenner discovered a safer immunizing technique that could replace the preexisting variolation technique, the vaccination.
The method of variolation encountered significant death rate which led the world go panic. Therefore, physicians were on the quest of finding a new and more secure method of immunization with minimal or no death rates. On this basis, an English physician named Edward Jenner (1748–1823) searched for a cure for smallpox, a devastating disease that rendered the world helpless. Jenner became interested in certain individuals who were immune to smallpox because they had contracted cowpox in the past. He personally witnessed this when he noticed that a dairymaid was immune to smallpox