Why were polio epidemics especially feared in the United States during the 1940s and early 1950s?

During the 1940s and early 1950s, polio epidemics were deeply feared in the United States because the disease frequently caused permanent paralysis and, in some cases, death due to respiratory complications. As the virus primarily struck during the summer and early autumn, it created a sense of "summertime terror" that led parents to keep children away from public spaces like swimming pools and movie theaters to avoid exposure.12

The fear was compounded by the visible impact of the disease. Patients suffering from respiratory failure were often treated in iron lungs, and these individuals were sometimes displayed in public to raise awareness and funds for research. Because the virus was unpredictable and could strike healthy individuals, it became a major public health concern that dominated the press and public consciousness until the development of an effective vaccine in 1955.12