A Look Back at Polio: Lessons from History

A heat map titled 'Polio: number of infected people' shows cases per 100,000 people across U.S. states from 1930 to 1965, with colors indicating case rates. A red vertical line labeled 'vaccine introduced' marks 1955, where the map visually shows a sharp decline in cases after that year. The source is cited as graphics.wsj.com/infectious-diseases-and-vaccines.

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