FILE - In this file photo dated Tuesday Jan. 21, 2014, a Pakistani health worker gives a child a polio vaccine at the door way of his home, while going house to house checking on children who need the vaccine, in Rawalpindi, Pakistan. 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 "extraordinary event" requiring a coordinated international response.(AP Photo/Muhammed Muheisen, FILE)
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