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    { "id" : "http://dbpedia.org/resource/Polio_vaccine"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Two polio vaccines are used throughout the world to provide immunity to the virus that causes poliomyelitis (or polio). The first was developed by Jonas Salk through the use of HeLa cells and first tested in 1952. Announced to the world by Dr Thomas Francis Jr. on 12 April 1955, it consists of an injected dose of inactivated (dead) poliovirus. An oral vaccine was developed by Albert Sabin using attenuated or weakened poliovirus." ] ,
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