By tracing cellphones, Pakistan makes inroads in war against polio

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ISLAMABAD, PAKISTAN — In a surprising turnaround, Pakistan appears to be finally getting a handle on its polio epidemic, thanks to unorthodox tactics such as tracking residents’ cellphones.
The 85 percent decline in new cases this year is boosting confidence that Pakistani officials are on pace to stop the spread of the virus here, perhaps as early as next year. If Pakistan can achieve that goal, the world will take a major step toward becoming ­polio-free.