To Foil Salmonella, Cook Your Tomatoes

Mark Roh, U.S. Food and Drug Administration's acting regional director holds a bag of tomatoes being tested for salmonella bacteria at FDA's southwest regional research lab, in Irvine, Calif., Monday June 9, 2008, where microbiologists are working to trace the source of the outbreak. McDonald's, Wal-Mart and other U.S. chains have halted sales of some raw tomatoes as federal health officials work to trace the source of a multistate salmonella food poisoning outbreak. (Kevork Djansezian/AP)

Tomatoes are offered for sale at a produce store June 9, 2008 in Chicago, Illinois. Tomatoes are suspected to be responsible for salmonella related illnesses in at least 17 states. McDonald's said Monday it will stop serving sliced tomatoes in its U.S. restaurants until the source of the salmonella outbreak is discovered. (Scott Olson/Getty Images)