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How many paralytic polio cases were recorded in the United States in 1952?
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A health care worker giving a polio vaccine to a child in Katsina state, Nigeria, 2014.
In 1952, the United States experienced its peak incidence of polio, during which approximately 21,000 cases of paralytic polio were recorded. This figure represented a rate of 13.6 cases per 100,000 population.1