Vaccine-one+thing+and+milions+of+lifes

The vaccine The vaccine was invented by Edward Jenner, On December 1, 1796. It may be one of the things that saved more people in the planet.The vaccine was created after a good observation of Edward Jenner,He noticed that milkmaids did not generally get smallpox, Jenner theorized that the pus in the blisters which milkmaids received from (a disease similar to smallpox, but much less virulent) protected the milkmaids from smallpox. He may have had the advantage of hearing stories of Benjamin Jesty and others who deliberately arranged cowpox infection of their families, and then noticed a reduced smallpox risk in those families.