It seems that vaccines are developed after mankind developers better cleanliness habits? They should add how many died from the vaccines. https://www.google.com/search?rlz=1C1CHBF_enUS778US778&tbm=isch&q=England+Wales+vaccine+history+chart&chips=q:england+wales+vaccine+history+chart,online_chips:measles&usg=AI4_-kSWmci0B8XmJO_uPXAXzi3KiyWeTA&sa=X&ved=0ahUKEwjossL5o6LgAhWB7oMKHTewAOgQ4lYIKSgA&biw=1536&bih=750&dpr=1.25#imgrc=69uha7crGzvnoM: