Silver Book Fact
Eradication of smallpox has saved 40 million lives worldwide
Since global vaccination efforts wiped out smallpox disease in 1979, infections in 350 million people have been prevented and 40 million lives have been saved.
Ehreth J. The Global Value of Vaccination. Vaccine. 2003; 21(7-8): 596-600. http://www.ncbi.nlm.nih.gov/pubmed/12531324