The Cyclospora Mystery: How Human Poop Got on So Much Lettuce

U.S. health officials linked six more states to what’s now the largest outbreak of cyclospora in American history — an outbreak that has contributed to at least two deaths, sickened thousands of people and left the rest of us increasingly scared of salad. Today, Christina Jewett and Caroline Hopkins Legaspi, two public health reporters who have covered the parasite for The New York Times, discuss what’s been learned about where it comes from, how it spread so quickly and why our food safety system seems to be powerless to stop it. Guest: Christi...