Silver Book Fact
Value of smallpox eradication
An estimated $100 million spent in eradicating smallpox from 1967 to 1977 saved the world around $1.35 billion a year.
Barrett S. Eradication Versus Control: The economics of global infectious disease policies. Bulletin of the WHO. 2004; 82: 683-8. http://www.who.int/bulletin/volumes/82/9/683.pdf