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WHO: Pakistan city is world’s largest polio pool

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ISLAMABAD — Pakistan’s city of Peshawar is the world’s largest pool of the polio virus, with the vast majority of cases in the country and neighboring Afghanistan tracing back to the restive northwestern city, the World Health Organization announced today.

Some 90 percent of polio cases found around Pakistan can be genetically linked to the city, the U.N. organization said. Even 12 of the 13 cases reported in 2013 in neighboring Afghanistan can also be traced back to Peshawar, officials said, showing the challenge of combating the disease in a country where militants target vaccinators.

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