A deadly salmonella strain is spreading through American poultry, and there’s not much the government can do to stop it. ProPublica’s Bernice Yeung explains.Today’s show was produced by Will Reid with help from Grandma Chamberlin, edited by Matt Collette, engineered by Efim Shapiro, fact-checked by Laura Bullard and hosted by Sean Rameswaram.Transcript at vox.com/todayexplainedSupport Today, Explained by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices