The total amount of recalled "not intact raw beef products" now exceeds more than 12 million pounds.
"FSIS continues to investigate diseases associated with this widespread outbreak, and possibly other products from other companies may be recalled," the letter said.
Consumers should dispose of or recall recalled beef. The Food Safety and Inspection Service said it was worried that consumers would unknowingly recall beef in their freezer. In addition, "only consume ground beef that has been cooked to a temperature of 160 ° F. Other cuts of beef should be cooked to a temperature of 145 ° F and allowed to rest for at least 3 minutes," the USDA said.
Salmonella symptoms usually begin 12 to 72 hours after eating contaminated food. These include diarrhea, abdominal cramps and fever that last between four and seven days. Most people recover on their own, but those who suffer from persistent diarrhea may need to be hospitalized.