photo of a child receiving a drop of oral polio vaccine from an adult gently holding the child's chinFor VOA, Elise Cutts (@EliseCutts) explains vaccine-derived poliovirus — implicated in the recent outbreak in New York — and lays out the risks and benefits of the two forms of vaccine: inactivated polio vaccine, which is used in the U.S., and the oral polio vaccine, which can lead to outbreaks in undervaccated populations but has some notable advantages. She emphasizes the vaccines’ safety and the imperative to close vaccination gaps to keep all kids safe. Image: Public domain (Centers for Disease Control and Prevention)