A medical worker prepares a dose of a COVID-19 vaccine in Peshawar, Pakistan, March 2021
Saeed Ahmad Xinhua / eyevine / R​edux

Late last year, in Karachi’s Metroville Colony, Sadia Rizwan went door-to-door administering a two-drop oral polio vaccine to children. She visited dozens of homes each day, calling on more than 350 households in just ten days. The COVID-19 pandemic was raging across Pakistan, and Rizwan was acutely aware of the risks she was taking to carry out a polio vaccination campaign—risks that were deepened by the unwillingness of some families she visited to wear masks or maintain social distance. But as a longtime resident of Metroville, she also knew firsthand the havoc polio wreaks when left unchecked.

Rizwan is

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