The health worker, identified as Tahira, was waiting at a bus stop after leaving her house to go on duty.
She was transferred to a nearby hospital, where health officials say she sustained at least two bullet injuries.
A previous attack in Charsadda on polio health workers resulted in one worker being injured. The attack was claimed by Tehreek-e-Taliban Pakistan (TTP) faction Jamaatul Ahrar.
The attack had taken place in Charsadda during Polio Day when a polio worker and a student of tenth-grade were fired upon in Sadar Ghari Shabqadar.
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