The latest development comes as health workers conclude a targeted vaccination drive in high-risk areas later Friday. Earlier this month, authorities launched a weeklong nationwide anti-polio campaign aiming to immunize 44.2 million children under the age of five.
Escorted by police, polio teams go door-to-door to administer the oral vaccine, though they are often attacked by militants who falsely claim that vaccination efforts are part of a Western plot to sterilize Muslim children. Since the 1990s, more than 200 polio workers and the police assigned to protect them have been killed in attacks.