The Kroger Co. on Wednesday expanded its voluntary recall of some ground beef products to stores in more than 20 states, saying the meat may be contaminated with E. coli.

The recall involves ground beef products in Styrofoam tray packages wrapped in clear cellophane or purchased from an in-store service counter. The following chart provided by Kroger explains the range of "sell-by" dates that customers should check:

— Fred Meyer: May 21-July 5.

— QFC: May 21-July 5.

— Kroger stores: May 21-July 3, except Kroger stores in Georgia, South Carolina, Alabama, and Knoxville, Tenn., and Kroger's Mid-Atlantic division, which includes stores in North Carolina, northeastern Tennessee, Virginia and West Virginia; Kroger stores in Georgia, South Carolina, Alabama and Knoxville are not involved in the recall of ground beef in Styrofoam trays or from in-store service counters.

— Kroger Mid-Atlantic: May 19-June 6.

— Fry's: May 21-July 3.

— Ralphs: May 21-July 3.

— Smith's: May 21-July 3.

— Baker's: May 17-June 4.

— King Soopers: June 20-July 3.

— City Market: June 20-July 3.

Customers who shop at Hilander, Owen's, Pay Less and Scott's should follow the "sell-by" dates listed for Kroger stores.

Kroger also is recalling Private Selection Natural ground beef sold in 16-ounce packages that were in the self-service meat case with sell-by dates of July 11 through July 21. The product was available at all Kroger stores, Dillons, Fred Meyer, Baker's, Smith's and Fry's.

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Source: The Kroger Co.