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The first major outbreak of polio in the U.S occured in Vermont with 132 cases.
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Franklin Roosevelt's left leg was paralyzed by polio when he was 39 years old.
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Philip Drinker, inventor of the iron lung, published a paper describing how the machine can benefit polio victims.
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Franklin Roosevelt founds the NFIP to combat polio.
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Salk earned his MD from New York University.
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57,628 polio cases were reported in the United States in 1952 alone.
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Salk gives the vaccine to his wife and three sons.
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The Francis Field Trial begins and children get first vaccinations.
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Thomas Francis announced the successful results in a press conference at the University of Michigan.
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GPEI is founded in order to vaccinate developing countries and record polio cases with a goal of eliminating polio.
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The Pan American Health Organization had reported that three years had passed since the last case of wild polio in the Americas.
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At the end of 2014 the GPEI announced only 22 polio cases occured in the entire world.
