People walk near a polio awareness campaign poster pasted on a wall outside Colvin Women's Hospital in Allahabad, India, Monday, Jan. 13, 2014. India on Monday marked three years since its last polio case was reported, a major milestone in eradicating the crippling disease. (AP Photo/Rajesh Kumar Singh)

People walk near a polio awareness campaign poster pasted on a wall outside Colvin Women's Hospital in Allahabad, India, Monday, Jan. 13, 2014. India on Monday marked three years since its last polio case was reported, a major milestone in eradicating the crippling disease. (AP Photo/Rajesh Kumar Singh)