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FILE-- In this file photo dated Wednesday April 24, 2013, a Somali child receives a polio vaccine, at the Medina Maternal Child Health center in Mogadishu, Somalia. In an announcement Monday May 5, 2014, the World Health Organization (WHO) says the spread of polio is an international public health emergency that threatens to infect other countries with the crippling disease and could ultimately unravel the nearly three-decade effort to eradicate it, describing the ongoing polio outbreaks in Asia, Africa and the Middle East as an &quot;extraordinary event&quot; requiring a coordinated international response.(AP Photo/Ben Curtis, FILE)

UN: Spread of polio now a world health emergency

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** FILE ** In this file photo dated Monday Nov. 25, 2013, a Pakistani child is vaccinated against polio by a health worker in Islamabad, Pakistan, Monday, Nov. 25, 2013. (AP Photo/Muhammed Muheisen, FILE)

U.N.: Spread of polio now a world health emergency

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Experts debate destroying last smallpox viruses

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