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Who invented the first effective vaccine against polio?

Question:

Who invented the first effective vaccine against polio?

Polio:

Less than 100 years ago, polio killed and crippled millions of people around the world. In 1952 alone, more than 3,000 Americans died from polio while another 21,000 were crippled. In fact, former President Franklin D. Roosevelt was crippled by polio. However, few of us ever worry about polio these days because it is nearly eradicated worldwide.

Answer and Explanation:

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In 1952, Jonas Salk created the first polio vaccine. While most vaccines used related but less severe forms of a disease, like using cowpox to...

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