@luckytran
Started with smallpox vaccination in about 1850s.
Antibiotics from about 1910.
But Penicillin was only widely available from 1945 after WWII.
Polio vaccine 1950 a major breakthrough.
So, yes, vaccines save millions of lives more than small % of reaction. So do antibiotics.
But Michael Okuda's claim on graveyards is inaccurate.
It was Pasteurisation of milk, sanitation & other environmental factors that reduced infant mortality in the USA 1900s to 1950s.
https://en.wikipedia.org/wiki/Infant_mortality#History