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untilBetween 17 April and 1 May, every country in the world currently using oral poliovirus vaccine (OPV) must withdraw the trivalent vaccine (tOPV) and replace it with the bivalent vaccine (bOPV). This will continue to protect infants from poliovirus types 1 and 3 while withdrawing the type 2 component, thereby mitigating the risk of seeding new type 2 circulating vaccine-derived poliovirus (cVDPV2). See more at: http://www.polioeradication.org/mediaroom/newsstories/Preparations-for-the-Switch-Accelerate/tabid/526/news/1353/Default.aspx