More than 6.5 million pounds of ground beef and beef patties have been recalled due to a salmonella outbreak that has so far sickened at least 57 people from 16 states, the USDA announced Thursday. The affected beef comes from Arizona-based meat producer JBS Tolleson, Inc., and was packaged between July 26 and Sept. 7, CNN reports. It was sold nationwide under the brand names Walmart, Cedar River Farms Natural Beef, Showcase, Showcase/Walmart, and JBS Generic. Customers should check for products with "EST.267" inside the USDA mark of inspection, the AP reports. Full recall information can be found here. (More beef recall stories.)