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A total of 145,000 children in North Waziristan and 81,000 in South Waziristan were supposed to be immunized during this campaign, he said.

“We will use all possible means once security situation improved to immunize children in Waziristan,” he said. “We have to protect our children.”

Mr. Coleman said there have been 23 reported cases of polio so far this year, compared with roughly 58 for the similar time last year. However, the monsoon season is approaching, and the higher temperatures, rains and displacement because of flooding sometimes can increase the disease’s transmission.

Associated Press writers Riaz Khan in Peshawar, Pakistan, and Rebecca Santana in Islamabad contributed to this report.