ອົງການອະນາໄມໂລກ ປະກາດໃຫ້ທະວີບອາຟຣິກາ ເປັນເຂດປອດໂປລີໂອ

All of Africa has reached a very important milestone. The World Health Organization has declared that the entire continent is now free of the wild poliovirus. VOA's Carol Pearson reports that this is a time for celebration but not a time to rest.