WHO: Pakistan city is world's largest polio pool

FILE - in this Monday, Sept. 10, 2012 file photo, a Pakistani medic gives a polio vaccine to a child in Peshawar, Pakistan. The World Health Organization said the northwestern Pakistani city of Peshawar has become the largest poliovirus reservoir in the world. (AP Photo/Mohammad Sajjad)

FILE - in this Monday, Sept. 10, 2012 file photo, a Pakistani medic gives a polio vaccine to a child in Peshawar, Pakistan. The World Health Organization said the northwestern Pakistani city of Peshawar has become the largest poliovirus reservoir in the world. (AP Photo/Mohammad Sajjad)

More Photo Galleries

Happening Now