Chipotle shares take fresh hit after Boston College students fall ill

Before you go, we thought you'd like these...
Eight Boston College Basketball Players Sick After Eating Chipotle

LOS ANGELES (Reuters) -- Thirty Boston College students got sick after eating at Chipotle Mexican Grill over the weekend, a school spokesman said, sending company shares down 6 percent in extended trading on Monday on fears of more food poisoning problems at the burrito chain.

Chipotle said it had temporarily closed its restaurant in Boston's Cleveland Circle, where a college spokesman said all the students reported eating, while it works with local health officials to investigate the illnesses.

SEE ALSO: 'Unhinged': Republicans are slamming Donald Trump's 'outrageous' proposal to stop Muslims from entering the US

The sickened students included members of the Boston College men's basketball team, spokesman Jack Dunn said.

The Massachusetts Department of Public Health received more than 20 reports of illness from Boston College students and is working to determine if they are tied to a Chipotle-linked outbreak of E. coli, spokesman Scott Zoback said.

More on Chipotle closures around the country:

17 PHOTOS
Chipotle closings because of E.coli
See Gallery
Chipotle shares take fresh hit after Boston College students fall ill
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)
of
SEE ALL
BACK TO SLIDE
SHOW CAPTION +
HIDE CAPTION

Federal health investigators said on Friday the E. coli outbreak had expanded to nine states, with 47 of the 52 people sickened having reported eating at the chain.

"We do not have any evidence to suggest that this incident is related to the previous E. coli incident," Chipotle spokesman Chris Arnold said in an email. "There are no confirmed cases of E. coli connected to Chipotle in Massachusetts."

SEE ALSO: Fox News suspends contributors for vulgar criticism of Obama on live TV

Boston College officials sent alerts on Monday to students, informing them of the suspected food poisoning.

The time between ingesting E. coli bacteria and feeling sick is usually three to four days, but may be as short as one day or as long as 10 days, according to the U.S. Centers for Disease Control and Prevention. Symptoms often begin slowly with mild belly pain or non-bloody diarrhea that worsens over several days.

The Chipotle outbreak was first identified in Seattle and Portland, Oregon, and the company temporarily closed all 43 of its restaurants in those markets on Oct. 31.

SEE ALSO: 35 years ago today, John Lennon was killed

The states with reported cases are Illinois, Maryland, Pennsylvania, California, Minnesota, New York, Ohio, in addition to Oregon and Washington. People in those states were sickened between mid-October and mid-November.

Chipotle warned on Friday that the outbreak was expected to cause this quarter's sales at established restaurants to fall for the first time in company history. It also said sales could be battered by additional reports of illness.

Chipotle shares were down 6.4 percent to $516.61. Before the reports of illness, shares traded at nearly $650.

Related: See cases of E. coli outbreaks in recent years:

31 PHOTOS
E. coli cases and food poisoning
See Gallery
Chipotle shares take fresh hit after Boston College students fall ill
A microbiologist points out an isolated E. coli growth on an agar plate from a patient specimen at the Washington State Dept. of Health Tuesday, Nov. 3, 2015, in Shoreline, Wash. Chipotle's industry-leading commitment to tracking its ingredients from farm to table is being put to the test by an E. coli outbreak that has sickened at least 37 people as of Tuesday, nearly all of whom ate recently at one of the chain's restaurants in Washington state or Oregon. Scientists also said that they identified the specific microorganism responsible, which they believe was carried on fresh produce such as lettuce or tomatoes. (AP Photo/Elaine Thompson)
A sign posted on the door of a Chipotle restaurant in Portland, Ore. reads "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)
BOSTON - AUGUST 23: Colony of E. coli cells are grown in the synthetic biology lab at Harvard Medical School in Boston on Tuesday, August 23 2011. (Photo by Wendy Maeda/The Boston Globe via Getty Images)
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)
ELIOT, ME - MAY 26: Kyler Dove, a seventh grader at Marshwood Middle School in Eliot, stops to take a drink from one of the 11,520 water bottles donated to the school Tuesday, May 26, 2015 by Cumberland Farms. Home Depot and Hannaford have also made donations to the school as it manages the current E coli scare. (Photo by Jill Brady/Portland Press Herald via Getty Images)
FILE - In this Thursday, July 3, 2014 file photo, smoke wafts up as hamburgers are cooked on a grill outside the White House in Washington. On Thursday, May 14, 2015, the CDC says fewer Americans are getting sick from a nasty germ sometimes found in undercooked hamburgers. Illnesses from a dangerous form of E. coli bacteria have fallen 20 percent in the previous few years. (AP Photo/Jacquelyn Martin)
In this photo taken Oct. 4, 2014, a sign in the Seattle suburb of Mercer Island, Wash., cautions residents to boil water before drinking it. On Monday, Oct. 6, 2014 Mercer Island water samples tested clean of E. coli for a fourth consecutive day, but the boil water advisory still stands, officials said. (AP Photo/Doug Esser)
PORTLAND, OR - MAY 23: A shopper looks for bottled water on nearly empty shelves at a New Seasons Supermarket May 23, 2014 in Portland, Oregon. Oregon health officials ordered Portland to issue a boil-water alert after three separate samples tested positive for E. coli, a bacterium that can cause severe gastrointestinal illness. (Photo by Natalie Behring/Getty Images)
Jack Kurtz, 10, right, and mother Paula Gillett pose for portrait in their Rockford, Illinois home, November 5, 2009. Jack recovered from a food-borne illness last year. The source of the E. coli that hospitalized him was never determined. (Photo by Lane Christiansen/Chicago Tribune/MCT via Getty Images)
Madison Sedbrook, 6, right, and her mother Cindy are in their home at Highlands Ranch on Tuesday. Madison's parents are suing because she got e coli from eating raw cookie dough recalled by Nestle. Hyoung Chang/ The Denver Post (Photo By Hyoung Chang/The Denver Post via Getty Images)
Kristen Miglietta, 12, and Thomas Duen, 11, left, hand out cases of bottled water to residents at Pembroke High School in Pembroke, Mass., Monday morning, Aug. 11, 2008. E.coli bacteria was detected in repeat samples of the town's contaminated water supply taken on Wednesday Aug. 6, 2008 and town officials say residents could be under a "boil order" for the next two days. (AP Photo/Stephan Savoia)
Whole Foods stores, like this one photographed on Saturday, Aug 9, 2008 in Omaha, Neb., has recalled fresh ground beef sold between June 2 through Aug. 6 because of worries about E. coli contamination as part of a federal recall on beef supplied by Omaha-based Nebraska Beef Ltd. (AP Photo/Dave Weaver)
A culture of E. coli 0157:H7 bacteria grows in a petri dish Thursday, Nov. 29, 2007, at the Roman L. Hruska U.S. Meat Animal Research Center in Clay Center, Neb., where government scientists are working to unlock secrets contained in the genetic makeup of the cattle, and why E. coli contamination appeared to be rising. (AP Photo/Nati Harnik)
Melissa Herzog and her eleven years old daughter Lauren pose for a photograph, May 17, 2008 in their house in Rancho Cucamonga, Calif. Herzog, whose daughter spent two months in the hospital after her kidneys failed because of E. coli poisoning, is one of the families suing Organic Pastures over the 2006 outbreak that health officials determined was probably caused by raw milk from the dairy. (AP Photo/Hector Mata)
Alyssa Chrobuck, who was hospitalized with E. coli during the 1993 Jack in the Box outbreak. displays a few of the many medications she takes and a photo of her as a child in her hospital bed Friday, Jan. 18, 2008, in Seattle. Now 20, Chrobuck has a host of unusual health problems that she says her doctors have attributed to that illness. (AP Photo/Elaine Thompson)
** FOR RELEASE MONDAY, JUNE 9--FILE ** In this , Friday, Oct. 5, 2007 file photograph, an employee walks past loading bays at the Topps Meat Co. plant in Elizabeth, N.J. Documents obtained by The Associated Press and interviews show that the now-defunct company cut back on testing for E. coli and disregarded sanitary issues, but also that federal food inspectors overlooked crucial evidence that Topps used risky processing procedures and operated under a flawed food safety plan. (AP Photo/Mike Derer,file)
UPDATES latest details on illnesses; graphic shows E. coli outbreak by state; 2c x 4 3/4 inches; 96.3 mm x 120.7 mm
Sen. Barbara Boxer, D-Calif., speaks during a news conference on Capitol Hill in Washington, Tuesday, Oct. 2, 2007, to oppose a Farm Bill amendment that would eliminate a 40-year-old protection in the meat and poultry inspection acts and increase the risk of food borne illnesses. At right is a photograph of Alex, Donley, 6, who died of E.coli poisoning. (AP Photo/Dennis Cook)
PHILADELPHIA - FEBRUARY 21: A BJ's Wholesale Club awaits customers on February 21, 2007 in Philadelphia, Pennsylvania. Yesterday, the giant wholesaler announced a voluntary recall of prepackaged Wellsley Farms mushrooms, due to possible trace amounts of E.coli. No cases of the illness have been reported. (Photo by Jeff Fusco/Getty Images)
A worker harvests romaine lettuce in Salinas, Calif., Thursday, Aug. 16, 2007. Government regulators never acted on calls for stepped-up inspections of leafy greens after last year's deadly E. coli spinach outbreak, leaving the safety of America's salads to a patchwork of largely unenforceable rules and the industry itself, an Associated Press investigation has found. (AP Photo/Paul Sakuma)
**FILE** In this July 30, 2007 file photo, shoppers walk past displays of produce at the Whole Foods in Cambridge, Mass. Nebraska Beef Ltd. is recalling 1.2 million pounds of beef because the products may be contaminated with E. coli bacteria. Some of Nebraska Beef's products were sold by Whole Foods Market, which also announced a recall Friday, Aug. 8, 2008. A Whole Foods spokeswoman said it had received reports that seven people in Massachusetts and two people in Pennsylvania who shopped at Whole Foods Market became ill. (AP Photo/Elise Amendola, File)
People read the sign on the door that says this Taco Bell restaurant in South Plainfield, N.J., is closed Monday, Dec. 4, 2006. An outbreak of E. coli bacterial infections in central New Jersey has grown to 19 confirmed cases, a health official said Monday. At least 11 of them ate at this Taco Bell restaurant in South Plainfield, and authorities were expected to finish tests on restaurant workers Monday. (AP Photo/Mel Evans)
A sign is seen in the drive through of a Taco Bell store in Philadelphia, Thursday, Dec. 7, 2006. Taco Bell ordered the removal of green onions from its 5,800 restaurants nationwide Wednesday after samples appeared to have a harsh strain of E. coli. All 15 Taco Bell restaurants in Philadelphia voluntarily closed Wednesday following a recommendation by the city's Department of Public Health. (AP Photo/Matt Rourke)
People are seen as they dine at a Taco Bell restaurant in South Plainfield, N.J., Tuesday, Dec. 12, 2006. All but four of Taco Bell's 86 New Jersey restaurants were back in business Tuesday even as the fast-food chain and health officials across the country attempted to determine what caused an outbreak of E. coli that sickened scores of customers in four states. (AP Photo/Mel Evans)
A worker walks by a fresh spinach display, at left, at at fresh produce market in Santa Clara, Calif., Friday, Oct. 20, 2006. Growers and marketers are concerned that the country's estimated $374 million spinach business will not recover following the recent E. coli outbreak that killed three people and sickened nearly 200 others. (AP Photo/Marcio Jose Sanchez)
A spinach field is seen in San Juan Bautista, Calif., Friday, Oct. 13, 2006. Experts say the discovery of deadly E-coli bacteria in cow manure near a Salinas Valley spinach field is showing how difficult it is to police an area where vegetable farms, ranches and expanding subdivisions all compete for space.(AP Photo/Marcio Jose Sanchez)
Produce is shown at a grocery store, Tuesday, Sept. 19, 2006, in downtown Cleveland. The tainted spinach scare over an E. coli outbreak leaves salad lovers, and restaurants, with fewer choices when cooking or eating out. The outbreak has spread to at least 21 states including Ohio, where the death of a 23-month-old girl is under investigation. (AP Photo/Tony Dejak)
** FILE ** In this undated photo provided by KPVI-TV, Kyle Algood, 2, is shown. Algood died Wednesday, Sept. 20, 2006, in a Utah hospital from kidney failure attributed to contaminated spinach, health officials confirmed Thursday, Oct. 5, 2006. (AP Photo/KPVI-TV via The Idaho State Journal)
** FILE ** Maple-glazed smoked ham sit on racks as workers process roast beef at the Dietz & Watson plant in Philadelphia in this April 22, 2004, file photo. White anti-bacterial foam is seen on the floor. The first major changes to food inspection in a decade will increase federal scrutiny of meat and poultry plants where the danger from E. coli and other germs is high or where past visits have found unsafe practices. The new policy will result in fewer inspections at plants with lower risks and better records for handling meat and poultry. (AP Photo/Jacqueline Larma, File)
** FILE ** This file photo from June 7, 2000 shows beef sides hanging in a chilling room at the Excel slaughterhouse in Schuyler, Neb., Wednesday June 7, 2000. In the summer months, as many as one in every two cows processed at the Excel plant carry the deadly E. Coli 0157:H7 bacteria, but before the plant's meat reaches consumers, the cattle and their carcasses are put through a state-of-the-art system of scrubbing, washes, rinses and steam-pasteurization designed to remove most, if not all, of the bacteria.(AP Photo/Nati Harnik)
of
SEE ALL
BACK TO SLIDE
SHOW CAPTION +
HIDE CAPTION

More from AOL.com:
The Supreme Court will hear a case this week that could radically alter college admissions in America
Allow Bill Nye (the Science Guy) to explain dreaming to you
Man named Bud Weisser found trespassing at Budweiser brewery

Read Full Story

People are Reading