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We haven’t seen polio in the US recently because of the success of the polio vaccine. The inactivated polio vaccine (IPV) is given as a series of four shots at 2 months, 4 months, 6-18 months, and 4-6 years of age.
Polio was eliminated from the U.S. in 1979. But on a few occasions, cases have been identified in the U.S. Polio also still exists in other countries around the world.
Polio causes paralysis and death, and there is no cure. Vaccination is the best defense to prevent polio infection.
The IPV vaccine used in the US has no serious side effects, so the vaccine’s benefits clearly outweigh its risks. https://www.chop.edu/vaccine-education-center/vaccine-details/polio-vaccine