Researchers hope that by probing the immune system, they can determine why children are developing a polio-like disease

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Almost 19,000 people died from overdoses of prescription painkillers — drugs like morphine and OxyContin — in 2014, the most recent year for which statistics are available, according to the Centers for Disease Control and Prevention. That same year, about 10,600 died from heroin overdoses — more than five times the number of fatalities from them in 2000

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Paul Offit likes to tell a story about how his wife, pediatrician Bonnie Offit, was about to give a child a vaccination when the kid was struck by a seizure. Had she given the injection a minute sooner, Paul Offit says, it would surely have appeared as though the vaccine had caused the seizure and probably no study in the world would have convinced the parent otherwise

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