General Mills Inc (GIS.N) on Tuesday issued a voluntary recall of about 10 million pounds of flour, saying it was working with health officials to investigate an outbreak of E. coli that had sickened 38 people in 20 U.S. states. 

 A multi-state E. coli outbreak that has sickened at least 19 people who ate rotisserie chicken salad sold at Costco Wholesale Corp's stores has been traced to a celery-and-onion mix used in the salad,