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Currently there are two polio vaccines that are in use throughout the world to fight against polio. Jonas Salk, the man who invented the first, started his work on a vaccine in 1955. The vaccine worked in two steps: first a dose of killed polio virus is injected, and then an oral polio vaccine must be taken which contains a live but much weakened form of the virus. This vaccine was first tested in 1957 on humans, and was later liscensed in 1962.
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