UPDATE: St. Louis E. coli investigation looks at grocer's salad bars

Tuesday, November 1, 2011 | 11:55 a.m. CDT

ST. LOUIS — Investigators for the U.S. Centers for Disease Control and the state of Missouri trying to determine the source of an E. coli outbreak in St. Louis are looking at salad bars at the region's largest grocery chain, a health official said Tuesday.