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On this day in 1955 at the University of Michigan, Dr. Thomas Francis Jr. announced that Dr. Salk's inactivated polio vaccine was "safe, effective and potent." The March of Dimes funde...
On this day in 1955 at the University of Michigan, Dr. Thomas Francis Jr. announced that Dr. Salk's inactivated polio vaccine was "safe, effective and potent." The March of Dimes funded this large r...