According to CNN, no single supplier, distributor or brand has been tapped as the direct source.
Seventeen patients have been hospitalized due to their illness.
The CDC conducted a multi-state investigation into the outbreak and discovered information that suggests that ground beef is the source of the outbreak.
According to results from the CDC's ongoing investigation, 84 percent of the individuals reporting illness said they had ingested ground beef prior to becoming ill. Currently, Kentucky has reported 54 cases - the higest among the six states - while Tennessee reports 28 cases. "Many ill people bought large trays or chubs of ground beef from grocery stores and used the meat to make dishes like spaghetti sauce and sloppy joe", the CDC said.
The CDC recommends thorough handwashing, washing fruits and vegetables, cooking meat thoroughly and avoiding cross-contamination in food preparation areas as ways to prevent E. coli illness.
Over the past year, E. coli prompted widespread recalls of romaine lettuce, but that outbreak was declared over in January. Symptoms include diarrhea, which can be bloody, severe stomach cramps and vomiting.
While most people recover after several days, some E. coli infection cases can be life-threatening.