CDC is collaborating with public health officials in several states and the U.S. Department of Agriculture’s Food Safety and Inspection Service (FSIS) to investigate a multistate outbreak of multidrug-resistant Salmonella Typhimurium infections linked to ground beef.

On December 15, 2011, Hannaford, a Scarborough, Maine-based grocery chain, recalled an undetermined amount of fresh ground beef products that bear sell-by dates of December 17, 2011 or earlier.