An outbreak of E. coli linked to Chipotle Mexican Grill restaurants in three states has spread to three more states, said the U.S. Centers for Disease Control and Prevention (CDC) on Friday.

The first cases of an E. coli outbreak were reported late last month in Oregon and Washington, which led to the hospitalization of 14 people. The disease then spread to Minnesota. However, the CDC announced that new cases have been reported in Turlock, California, Amherst, New York and Akron, Ohio. So far, there have been no serious complications or reported deaths, reports Reuters.

In a news release issued Friday, the CDC reported that a second person in Burnsville, Minnesota who ate at Chipotle was infected by the same strain of E. coli.

So far, 45 people have gotten food poisoning after contracting the E. coli O26 outbreak strain, while 43 of them say they ate at Chipotle in the week before they became sick, reports The Seattle Times. The CDC said it is aware of illnesses starting on dates ranging from Oct. 19 to Nov. 8.

Meanwhile, investigators are still searching for the specific ingredient causing patrons to become ill.

Following the outbreak, the popular burrito chain closed 43 restaurants in Oregon and Washington in late October. The restaurants were then reopened last week after being deeply cleaned and receiving fresh food supplies. However, Chipotle spokesman Chris Arnold said Friday that the eatery does not plan to close more stores.

"At the moment, we do not believe that it is necessary to close any restaurants," he said.

He added that all of the restaurants that have been linked to the e-coli outbreak have received additional cleaning and a new supply of ingredients.

Following the new reports of more outbreaks on Friday, shares of Chipotle plunged 10 percent, hitting a record low for the year.