More than 10 million people worldwide have contracted dengue from mosquitos this year. Now experts are worried it might show up at the Olympics. This episode was produced by Amanda Lewellyn and Peter Balonon-Rosen, edited by Matt Collette, fact-checked by Amina Al-Sadi and Laura Bullard, engineered by Patrick Boyd and Andrea Kristinsdottir, and hosted by Sean Rameswaram. Transcript at vox.com/today-explained-podcast Support Today, Explained by becoming a Vox Member today: http://www.vox.com/members Learn more about your ad choices. Visit podcastchoices.com/adchoices