if you do a search on google for cow and small pox you will discover the origin of vacination was due to a scientist's observations that people
exposed to cow pox were much less likely to contract small pox
did thisin history jenner (the scientest) tested this on a milk maid and a young lad called james and after a small infection of cowpox theboy didnt
get small pox (ifi remember ) jenner called it vacca as vacca is cow in latin or summat like that