The world nearly beat polio but fake records, an imperfect vaccine and missteps aided comeback

KARACHI, Pakistan: For the past decade, Sughra Ayaz has traveled door to door in southeastern Pakistan, pleading with parents to allow children to be vaccinated against polio as part of a global campaign to wipe out the paralytic disease. She hears their demands and fears. Some are practical – families need basics like food and water more than vaccines. Others are simply unfounded – the oral doses are meant to sterilize their kids.

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