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All of us can agree that in the United States we have come a long way toward controlling paralytic poliomyelitis. Within the past 5 years, some 93 million persons have used the Salk vaccine, and 78 million of them are now fully immunized. This is a monumental achievement in preventive medicine. I know of no parallel in medical history.
For this the medical and public health professions, the National Foundation, dozens of other organizations and thousands of individuals deserve great and enduring credit.
During these 5 years, there have not only been many improvements in the inactivated vaccine, but a marked increase in potency has been achieved. Steady progress has also been made in the development of oral vaccines. Dr. Hilary Koprowski of the Wistar Institute in Philadelphia, Dr. Herald Cox of the Lederle Laboratories, and Dr. Albert Sabin of the University of Cincinnati have been world leaders in this
Burney LE. ADVANCES IN POLIOMYELITIS IMMUNIZATION. JAMA. 1961;175(10):900-901. doi:10.1001/jama.1961.03040100064015