U.S. investigators said they're rethinking the premise fresh, unprocessed tomatoes caused the salmonella outbreak, sickening consumers nationwide.

Government officials released a 10-state report on Thursday that found the country’s efforts to cut foodborne illnesses have not succeeded in reducing the number of infections.

Federal officials in Atlanta say E. coli in leafy greens is one of the leading causes of foodborne illnesses in the United States. The Centers for Disease Control and Prevention's annual report on foodborne disease shows progress against some foodborne diseases has stalled, USA Today reported.