At a time when growing numbers of people are shunning vaccines, the polio vaccine proves that they work. As VOA's Carol Pearson reports, despite setbacks and a coronavirus pandemic, the world is making headway in eliminating the crippling disease.
At a time when growing numbers of people are shunning vaccines, the polio vaccine proves that they work. As VOA's Carol Pearson reports, despite setbacks and a coronavirus pandemic, the world is making headway in eliminating the crippling disease.
