What is the source of E. coli O103 in Beef that sickened 177 in 10 States?

According to the CDC and 10 state health agencies, a total of 177 people infected with the outbreak strain of E. coli O103 have been reported from 10 states – Georgia (41), Kentucky (65), Ohio (10), Tennessee (52), Virginia (2), Indiana (1), Florida (3), Illinois (1), Mississippi (1) and Minnesota (1). The Illnesses started on March 1, 2019, to April 14, 2019. Twenty-one people have been hospitalized. No deaths or f hemolytic uremic syndrome have been reported. Epidemiological data indicate that ground beef is the likely source of this outbreak. Officials at USDA-FSIS, in Kentucky, and Tennessee collected ground beef from a restaurant and an institution where ill people reported eating, and laboratory testing identified the outbreak strain of E. coli O103 in the ground beef collected in Tennessee. E. coli O103 was identified in the ground beef collected in Kentucky, but laboratory results are pending to determine if it is closely related to the E. coli O103 identified in ill people. Grant Park Packing in Franklin Park, Ill., recalled approximately 53,200 pounds of raw ground beef products on April 24, 2019. K2D Foods, doing business as Colorado Premium Foods, in Carrollton, Ga., recalled approximately 113,424 pounds of raw ground beef products on April 23, 2019. The CDC report did not reveal where the meat packaged by K2D did and Grant Park come from. The restaurant locations are also not revealed. @ https://www.cdc.gov/ecoli/2019/o103-04-19/index.html