Back to burritos: Chipotle-linked E. coli outbreak over, CDC says

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CDC Expected to Declare Chipotle E. Coli Outbreak Over

The CDC declared on Monday that the Chipotle Mexican Grill E. coli outbreak appears to be over.

Chipotle, under scrutiny for months over outbreaks of foodborne illness linked to its restaurants across several U.S. states, may have rattled investors, but teen and young adult customers were not deterred from the fast casual chain, according to the NPD Group, which continually tracks consumer's awareness about food safety outbreaks.

"Young adults represent the largest share of Chipotle's overall traffic," Bonnie Riggs, NPD Group's restaurant industry analyst, said in a statement. "Their willingness to overlook any food safety concerns to eat at Chipotle could be a result of unabashed loyalty or lack of awareness."

Consumers who did not remain loyal to the fast casual restaurant were won over by Chick-fil-A, Wendy's, Burger King and McDonald's.

Read More from CNBC: Are the Chipotle Outbreaks a Death Knell for Local Sourcing?

"What our research tells us is that Chipotle has a strong loyal base from which to build its business back up relatively quickly," says Riggs. "To win back the trust of their former customers, Chipotle will need to continually communicate all of the ways in which they are preventing any future outbreaks and prove to them that they able to deliver on their 'food with integrity' promise."

The fast casual chain will be briefly closing all its stores on Feb. 8th.

"We are hosting a national team meeting to thank our employees for their hard work through this difficult time, discuss some of the food safety changes we are implementing, and answer questions from employees," Chris Arnold, a spokesman, told CNBC.

The company's sales plunged 30 percent in December, following at least six outbreaks tied to Chipotle in the last year, including norovirus, E. coli and salmonella.

Read More from CNBC: Chipotle's New Plan Is to Give Away More Free Food

Look back at the Chipotle closings around the country:

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Chipotle closings because of E.coli
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Back to burritos: Chipotle-linked E. coli outbreak over, CDC says
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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