Southern California meatpacker United Food Group LLC expanded a recall to include 5.7 million pounds of fresh and frozen beef that may be contaminated with the potentially deadly E. coli bacteria, the U.S. Department of Agriculture said on Saturday.

Fourteen people in six Western states have fallen ill after eating the beef but all have recovered, the department said.

The beef was butchered and shipped in April, and is no longer on store shelves.

"However the products could be in consumers' freezers and it is important that consumers look for and return these products if they find them," the department said in a statement on its Web site.

United Food recalled 75,000 pounds of beef on June 3 and an additional 370,000 pounds three days later.

"The recall is being expanded out of an abundance of caution following a positive test of fresh ground beef subject to this recall provided by a patient in Arizona," the statement said.

E. coli O157:H7 can cause diarrhea and dehydration. Children, the elderly and people with poor immune systems are the most susceptible.

The labels of the products subject to recall bear the establishment number "EST. 1241" inside the USDA mark of inspection or printed on the package.

All of the products bear a use by/sell by date between April 15 and May 07, a freeze by date between April 23 and May 7 or a production date between April 6 and April 20. The frozen ground beef patty products bear a sell by date between August 6 and January 20, 2008, the department said.