When was polio the most prevalent in US?

Polio was most prevalent in the United States in the 1950s. In 1952, there were an estimated 58,000 cases of paralytic polio in the US, and over 3,000 people died from the disease. The introduction of the polio vaccine in 1955 led to a dramatic decline in the number of polio cases in the US, and the disease was declared eliminated from the country in 1979.