A new polio vaccine gives hopes that the disease can be completely eradicated. Polio can cause severe deformities and paralysis in children. The number of polio cases worldwide has dropped by over 99 percent in recent years because of a global vaccination campaign started in the 1950s. But the disease still threatens children in at least four countries in Africa and South Asia. Now, clinical trials in two countries have confirmed the effectiveness of a new vaccine. And the World Health Organization says complete eradication of polio could be in sight. VOA’s Vidushi Sinha has more.