The CDC reported 196 people have been infected in a multistate outbreak of Escherichia coli O103, as of May 13.
The outbreak, which has grown from 96 cases reported April 9, is likely due to ground beef products, according to the CDC.
Two distributors, Grant Park Packing and Colorado Premium Foods, have recalled thousands of pounds of ground beef. But the CDC said that no common supplier, distributor or brand of ground beef can account for the entire outbreak. Investigators said more products contaminated with E. coli O103 may still be in the market.
Ten states have reported cases of E. coli O103 linked to the ground beef products, up from six that had reported cases as of April 12. Kentucky, Tennessee and Georgia have reported the most cases with 69, 55 and 49, respectively.
Of the 196 people sickened, 28 have been hospitalized. While no deaths have been reported, two people developed hemolytic uremic syndrome, a type of kidney failure.
E. coli can cause severe stomach cramps, diarrhea that is often bloody, and vomiting. Symptoms typically last five to seven days.