AdvertisementAfrica Declares Wild Polio Is Wiped Out — Yet It Persists In Vaccine-Derived CasesAugust 25, 2020Maria GodoyfacebookEmailAn oral polio vaccine, which contains weakened live virus, is administered in a health enter in Togo. Africa has declared that wild polio has been eradicated, but a relatively small number of cases of vaccine-derived polio persist. (Universal Images Group via Getty)