Poliomyelitis, a viral infectious disease, had once paralyzed and crippled hundreds of thousands of children each year. But the development of vaccines and a global effort to eradicate the disease dramatically reduced the number of infections. However, the World Health Organisation says the success-story is at risk and the UN agency is expected to declare polio a global health emergency on Friday. The WHO says that a drastic rise in infections in Nigeria, Pakistan and Afghanistan, poses a threat to the rest of the world.

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Chad: Why Polio Is So Hard to Eliminate

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