Pittsburgh Post-Gazette: Sixty years later, recalling the Jonas Salk polio ‘miracle’
“Sixty years ago this coming Sunday, the Salk polio vaccine was declared ‘safe, effective, and potent,’ an announcement cheered with the fervor of a national holiday. … While there are still three countries where transmission of polio has never been interrupted — Nigeria, Pakistan and Afghanistan — great strides have been made elsewhere since 1955, when 600,000 around the world were infected with poliomyelitis…” (Linn, 4/7).