"OPV" OPV for as little as 12 cents polio forms of vaccination polio immunize unvaccinated people more expensive than the oral vaccine oral poliovirus vaccines, OPV polio polio immunize unvaccinated people dal 2016 è stato eliminato il tipo 2 Oral polio vaccine big font on the Polio Global Eradication Website. oral poliovirus vaccine dal 2016 è stato eliminato il tipo 2 polio "OPV" forms of vaccination polio immunize unvaccinated people oral polio vaccine (OPV).external icon polio oral poliovirus vaccines immunize unvaccinated people polio big font on the Polio Global Eradication Website. polio