Analyse @NobelPrize's tweets
@NobelPrize
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The polio vaccine developed by Jonas Salk was declared safe and effective on 12 April 1955. He used a technique by Nobel Laureates John Enders, Thomas Weller and Frederick Robbins to help develop his vaccine. Thanks to the vaccine polio is now endemic in only two countries. https://t.co/Bz88k0XxeS