Chipotle Mexican Grill stock plummeted in premarket trade on Monday after the burrito chain issued a warning on Friday for the fourth quarter and said its sales have been hammered due to an E. coli outbreak.
Earlier on Friday, the CDC reported the E. coli outbreak linked to the restaurant has expanded into nine U.S. states.
Chipotle said it now expects sales at established restaurants to fall 8 to 11 percent this quarter. The company's shares were down more than 11 percent in premarket trade Monday.
During regular trading, the stock ticked slightly lower after the CDC said seven more ill people have been reported in the multistate outbreak of E. coli infections linked to Chipotle locations.
This means three more states (Illinois, Maryland and Pennsylvania) have now reported illnesses as part of the outbreak, bringing the total to nine states. The investigation has not determined what food is linked to the E. coli outbreak.
According to the CDC, most people infected with E. coli develop symptoms of the illness about three to four days after contact with the germ.
E. coli is among a vast array of bacteria that live in the human gut and generally cause no problems. But some strains can cause serious symptoms and even be life-threatening, and are spread by oral contact with fecal matter.