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(Urbandale, IA) -- Over 100 kids are accidentally given a double dose of the coronavirus vaccine at a MercyOne clinic in the Des Moines metro. MercyOne says 107 kids under 12-years-old were given double doses in Urbandale last weekend. The hospital says all kids who got a double dose have been contacted. Getting a double dose could create increased post-vaccine responses, including a sore arm, headache, fatigue, or headache.