Polio vaccine is a vaccine used to prevent poliomyelitis, given in two forms: an inactivated poliovirus given by injection and a weakened poliovirus given by mouth. The World Health Organization recommends all children be fully vaccinated against polio, and the two vaccines have eliminated polio from most of the world, reducing the number of cases reported each year from an estimated 350,000 in 1988 to 33 in 2018. The first successful demonstration of a polio vaccine was by Hilary Koprowski in 1950 using a live attenuated virus taken by mouth, though it was not approved for use in the United States. The inactivated, killed polio vaccine developed by Jonas Salk was announced successful in 1955, and a further attenuated live oral vaccine developed by Albert Sabin came into commercial use in 1961. The polio vaccine is on the World Health Organization's List of Essential Medicines.
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1. Wikipedia
Wikipedia contributors, Wikimedia Foundationhttps://en.wikipedia.org/wiki/Polio_vaccine, lead sectionQuote, https://en.wikipedia.org/wiki/Polio_vaccine, lead section
Polio vaccine is a vaccine used to prevent poliomyelitis (polio).
2. Wikipedia: Polio Vaccine Online Reference Encyclopedia Article
WikipediaLead sectionQuote, Lead section
The success of an inactivated (killed) polio vaccine, developed by Jonas Salk, was announced in 1955.
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