by Peter Hotez, M.D., Ph.D. Hotez is Dean of the National School of Tropical Medicine at Baylor College of Medicine where he is also the Texas Children’s Hospital Endowed Chair in Tropical Pediatrics and the University Professor of Biology at Baylor University.

Smallpox was one of the most terrifying diseases in human history. Smallpox plagued humanity for thousands of years, killing one-third of its victims and disfiguring those who survived.

This blog post was originally published on Impatient Optimists, by Pascal Barollier, Director of Communications at Gavi, the Vaccine Alliance.