April 12, 2017 all-day

Polio Vaccine On April 12, 1955, Dr. Jonas E. Salk announced that a polio vaccine developed was “safe, potent and effective.” Incidence of the dreaded infantile paralysis, or poliomyelitis, declined by 95 percent following introduction of preventive vaccines. The first mass inoculations of children with the Salk vaccine had begun in Pittsburgh, PA, 23 February 1954.

Image: public domain, Wikimedia Commons

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