Tens of thousands of Americans — in the first half of the 20th century — were stricken by poliomyelitis. Polio, as it’s known, is a disease that attacks the central nervous system and often leaves its victims partially or fully paralyzed. The hallmarks of the Polio Era were children on crutches and in iron lungs, shuttered swimming pools, theaters warning moviegoers to not sit too close to one another. On April 12, 2015, we celebrate the 60th anniversary of a vaccine developed by Jonas Salk that prevented the disease and eventually led to its remarkable decline. The introduction of that vaccine in 1955 was one of the biggest medical advances in American history.

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