April 12: The Cure for Polio

The one-year field trial of Dr. Jonas Salk’s polio vaccine, involving 1.83 million children in 44 states, was announced a success on this date in 1955. The Francis Field Trials were the first to use the double-blind method that became standard in drug-testing. Dr. Thomas Francis Jr., director of the Poliomyelitis Vaccine Evaluation Center at […]

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