At the second Republican debate of the 2016 election cycle, Donald Trump parroted antivaccine pseudoscience, and Ben Carson walked back his previously strong support for vaccine mandates. Earlier in the campaign, Rand Paul blamed vaccines for "neurologic injury," and Chris Christie briefly pandered by questioning vaccine mandates. What's going on here? Is the Republican Party becoming the antivaccine party?
David Gorski / September 21, 2015