Daily Archives: April 12, 2019

April 12, 1955

On April 12, 1955 the University of Michigan Polio Vaccine Evaluation Center announced that the polio vaccine of Dr. Jonas Salk was “safe, effective, and potent.” Parents all over the United States demanded that the vaccine be administered to their children, since they had grown up with the specter of polio threatening them and their … Continue reading

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