The first U.S. vaccine trial is underway, and it’s missing something important - Black and Latino volunteers. Dr. Elmer Huerta, the host of CNN’s Spanish-language podcast Coronavirus: Realidad vs. Ficción, signed up for the Moderna trial and talks about why the success of a Covid-19 vaccine rests on the participation of minorities.To learn more about how CNN protects listener privacy, visit cnn.com/privacy