Chipotle's shares drop after latest food safety incident

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1 Chipotle Worker Diagnosed with Norovirus in Billerica

(Reuters) -- Shares of Chipotle Mexican Grill Inc fell more than 6 percent in morning trading on Wednesday, a day after the popular burrito chain operator said it would temporarily shut a Massachusetts restaurant after four employees fell sick.

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Chipotle is trying to repair its reputation after a series of food-safety incidents, including two E.Coli outbreaks that sickened about 50 people in 14 states and two separate norovirus outbreaks in Massachusetts and California.

RELATED: Previous Chipotle outbreaks

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Chipotle closings because of E.coli
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Chipotle's shares drop after latest food safety incident
Passers-by walk near a closed Chipotle restaurant on Monday, Dec. 7, 2015, in the Cleveland Circle neighborhood of Boston. Chipotle said late Monday that it closed the restaurant after several students at Boston College, including members of the menâs basketball team, reported âgastrointestinal symptomsâ after eating at the chain. The school said it was working with local health officials to determine the cause of the illness. (AP Photo/Steven Senne)
A sign is posted on the door to a Chipotle restaurant, Monday, Dec. 7, 2015, in the Cleveland Circle neighborhood of Boston. Chipotle said late Monday that it closed the restaurant after several students at Boston College, including members of the menâs basketball team, reported âgastrointestinal symptomsâ after eating at the chain. The school said it was working with local health officials to determine the cause of the illness. (AP Photo/Steven Senne)
A customer leaves a Chipotle restaurant in Seattle as the company started to reopen the outlets closed because of an E. coli outbreak in the Pacific Northwest, Wednesday, Nov. 11, 2015. (AP Photo/Donna Blankinship)
Customers leave a Chipotle restaurant with food in Portland, Ore., Wednesday, Nov. 11, 2015. Chipotle started reopening its restaurants in the Pacific Northwest on Wednesday after an E. coli outbreak sickened about 45 people, a high-profile example of foodborne illnesses that are more common than the public realizes, health experts say. Forty-three outposts of the Mexican food chain in Washington state and the Portland, Oregon, area were closed at the end of October because of the outbreak that hospitalized more than a dozen people. The first restaurants opened for lunch Wednesday. (AP Photo/Don Ryan)
A customer enjoys lunch at a Chipotle restaurant in Portland, Ore., Wednesday, Nov. 11, 2015. Chipotle started reopening its restaurants in the Pacific Northwest on Wednesday after an E. coli outbreak sickened about 45 people, a high-profile example of foodborne illnesses that are more common than the public realizes, health experts say. Forty-three outposts of the Mexican food chain in Washington state and the Portland, Oregon, area were closed at the end of October because of the outbreak that hospitalized more than a dozen people. The first restaurants opened for lunch Wednesday. (AP Photo/Don Ryan)
Rosanna Fleming enters a Chipotle restaurant for lunch as another customer enters a second door in the background in Portland, Ore., Wednesday, Nov. 11, 2015. Chipotle started reopening its restaurants in the Pacific Northwest on Wednesday after an E. coli outbreak sickened about 45 people, a high-profile example of foodborne illnesses that are more common than the public realizes, health experts say. Forty-three outposts of the Mexican food chain in Washington state and the Portland, Oregon, area were closed at the end of October because of the outbreak that hospitalized more than a dozen people. The first restaurants opened for lunch Wednesday. (AP Photo/Don Ryan)
Workers clean inside a still-closed Chipotle restaurant Monday, Nov. 9, 2015, in Seattle. Health officials in Washington and Oregon have said that more than three dozen people have gotten sick with E. coli in an outbreak linked to Chipotle restaurants in the two states. More than 40 Chipotle restaurants remain closed in Washington state and the Portland area while authorities search for the cause. (AP Photo/Elaine Thompson)
FILE - In this Nov. 9, 2015, file photo, pedestrians walk past a still-closed Chipotle restaurant in Seattle. An outbreak of E. coli that originated in the Pacific Northwest has spread south and east and has now infected people in six states. New cases have been reported in California, New York and Ohio, the Centers for Disease Control and Prevention said Friday, Nov. 20, 2015. (AP Photo/Elaine Thompson, File)
A worker sits at a counter inside a still-closed Chipotle restaurant Monday, Nov. 9, 2015, in Seattle. Health officials in Washington and Oregon have said that more than three dozen people have gotten sick with E. coli in an outbreak linked to Chipotle restaurants in the two states. More than 40 Chipotle restaurants remain closed in Washington state and the Portland area while authorities search for the cause. (AP Photo/Elaine Thompson)
Workers clean inside a still-closed Chipotle restaurant Monday, Nov. 9, 2015, in Seattle. Health officials in Washington and Oregon have said that more than three dozen people have gotten sick with E. coli in an outbreak linked to Chipotle restaurants in the two states. More than 40 Chipotle restaurants remain closed in Washington state and the Portland area while authorities search for the cause. (AP Photo/Elaine Thompson)
A closed Chipotle restaurant is shown, Tuesday, Nov. 3, 2015, in Federal Way, Wash. Chipotle closed 43 of its Pacific Northwest locations after the chain's third foodborne illness this year sickened about two dozen people. (AP Photo/Ted S. Warren)
A pedestrian, right, walks past a closed Chipotle restaurant Monday, Nov. 2, 2015, in Seattle. An E. coli outbreak linked to Chipotle restaurants in Washington state and Oregon has sickened nearly two dozen people in the third outbreak of foodborne illness at the popular chain this year. Cases of the bacterial illness were traced to six of the fast-casual Mexican food restaurants, but the company voluntarily closed down 43 of its locations in the two states as a precaution. (AP Photo/Elaine Thompson)
A sign posted on the door of a Chipotle restaurant in Portland, Ore. reads that the location is "temporarily closed due to a supply chain issue," on Monday, Nov. 2, 2015. An E. coli outbreak linked to Chipotle restaurants in Washington state and Oregon has sickened nearly two dozen people in the third outbreak of food borne illness at the popular chain this year. (AP Photo/Don Ryan)
FILE - In this Nov. 2, 2015, file photo, a pedestrian walks past a closed Chipotle restaurant in Seattle. Washington state health officials say they have found no source for the E. coli outbreak related to Chipotle and the chain's Pacific Northwest restaurants could reopen later this week. Washington state epidemiologist Dr. Scott Lindquist says all the tests of food from Chipotle stores in Washington and Oregon came back negative for E. coli. (AP Photo/Elaine Thompson, File)
A woman talks on the phone as she stands in the kitchen area of a closed Chipotle restaurant, Monday, Nov. 2, 2015, in Seattle. An E. coli outbreak linked to Chipotle restaurants in Washington state and Oregon has sickened nearly two dozen people in the third outbreak of foodborne illness at the popular chain this year. Cases of the bacterial illness were traced to six of the fast-casual Mexican food restaurants, but the company voluntarily closed down 43 of its locations in the two states as a precaution. (AP Photo/Elaine Thompson)
Signage hangs from a closed Chipotle restaurant in Portland, Ore., Monday, Nov. 2, 2015. Chipotle voluntarily closed down 43 of its locations in Washington and the Portland area as a precaution after an E. coli outbreak linked to six of its restaurants in the two states has sickened nearly two dozen people. (AP Photo/Don Ryan)
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"We suspect that investors and consumers will be sensitive to this announcement, particularly in light of the adverse news flow over the last six months at Chipotle," CRT Capital analyst Lynne Collier said in note to clients.

Chipotle's sales have fallen sharply since the E. Coli outbreaks late last year. Sales in the quarter ended Jan. 31 were down 18 percent compared with the third quarter.

The restaurant hit by the latest food scare, in the town of Billerica, outside Boston, was closed for a full cleaning, company spokesman Chris Arnold said on Tuesday.

The company and the Massachusetts Department of Public Health said that no customers were known to be sick.

"This is under investigation by local health department," Massachusetts DPH spokesman Scott Zoback said by email.

Chipotle did not immediately respond to requests for comment or additional information on Wednesday.

The company temporarily closed all of its U.S. restaurants on Feb. 8 during prime lunchtime hours to hold staff meetings on food safety.

Up to Tuesday's close of $524.69, the company's stock had fallen about 18 percent since the first E.coli outbreak was reported on Oct. 31.

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