As of Tuesday, 96 people from the states were infected with the strain of E. coli involved in the latest outbreak, reports federal medical institutions. The last reported illness began on March 26.
Research did not identify a particular food product, grocery store or restaurant chain as a source of infection.
Infected people get sick on average 3 to 4 days after eating or drinking something that contains bacteria according to CDC
Symptoms include severe stomach cramps, diarrhea and vomiting. Some people with an infection can also get a type of renal insufficiency called a hemolytic uremic syndrome, according to the CDC.
"Public and local public health officials interview patients with sick people to determine what they were eating and other exposures a week before their illness started," said the CDC.
Last year, an outbreak of E. coli, a romantic salad, was carried by 62 people in 16 states and Washington, DC