Benjamin Franklin regretted that he had not protected his son against smallpox.
History of Vaccines
In 1961, Sabin’s live, attenuated polio vaccine replaced Jonas Salk’s inactivated polio vaccine that had been in use since 1955.
George Washington mandated that every soldier in the Continental Army had to be inoculated against smallpox.
VAPP or vaccine-associated paralytic polio are cases of polio that are actually caused by the oral polio vaccine.