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- 13:10, 27 October 2010 S8600021 talk contribs uploaded File:Polio-Eradication-Initiative.jpg (==Oral Polio Vaccine== A bivalent oral polio vaccine (BOPV) is presently being used in countries with high existing polio rates, India and Nigeria. A recent WHO release has shown the largest ever year-to-year drop in polio cases following the use of BOPV)