Polio is an infectious disease that attacks the nervous system and can cause paralysis. Symptoms include fever, headache, and muscle pain. Jonas Salk invented the first polio vaccine in 1953 which was tested on monkeys. Albert Sabin later created an oral vaccine that became widely used. The vaccines drastically reduced polio cases in the US, from 58,000 cases in 1952 to just 61 cases in 1965, leading to eradication of polio in 1994.
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