U.S. health officials are warning the public not to eat certain brands of packaged salads, which they say are linked to two small, long-running listeria outbreaks in which three people died. One outbreak is linked to packaged salads produced by Fresh Express and another has been tied to packaged salads produced by Dole. The outbreaks are caused by different strains of listeria bacteria and there's no known link between them, the Centers for Disease Control and Prevention reported Thursday.
