On Saturday, Topps Meat Co. announced that the recall issued on Tuesday is now being expanded to include 21.7 million pounds of ground beef mostly sold at hamburger patties. This is a significant increase from the earlier announcement that 332,000 pounds may be contaminated with E. coli bacteria. Consumers are now being asked to check the back panels of Topps Meat products as the recall includes all those that should be sold between September 25, 2007 and the same date next year. The recall expansion was urged by three confirmed cases of E. coli-related illnesses and 22 more under investigation.