Eighteen people, mostly in Florida, have been confirmed with E. coli O26 infections, spurring Publix Super Markets Inc. to recall an undetermined amount of eight different ground beef products.

“Traceback information indicated that case-patients consumed ground chuck products purchased at various Publix Super Markets that was supplied by a yet-to-be determined source,” according to the recall notice posted by the USDA’s Food Safety and Inspection Service (FSIS). The FSIS reported it was notified about the outbreak on Aug. 16.

Other than the FSIS recall notice, no other federal or state agencies appeared to have posted any information about the outbreak as of last night. The FSIS reported that the federal Centers for Disease Control and Prevention is assisting Florida officials with their outbreak investigation.

Officials with FSIS and the Publix grocery chain are urging consumers to check their home freezers for unused portions of the ground beef products. Publix told outbreak investigators that all of the implicated products would have been purchased by customers from June 25 through July 31. The recalled products should be thrown away or returned to the place of purchase.

Although the producer was unknown as of yesterday afternoon, the recall notice says the ground beef products were shipped to Publix retail locations in several Florida counties, including Brevard, Charlotte, Citrus, Collier, Desoto, Flagler, Hernando, Highlands, Hillsborough, Indian River, Lake, Lee, Manatee, Marion, Orange, Osceola, Pasco, Pinellas, Polk, Sarasota, Seminole, St. Lucie, Sumter and Volusia.