A pedestrian walks past a closed Chipotle restaurant, Nov. 2, 2015, in Seattle.
Photo by Elaine Thompson/AP

Chipotle outbreak grows to 80 Boston College students

Updated

The number of Boston College students stricken with stomach symptoms grew to 80 on Tuesday, and all say they ate at a nearby Chipotle restaurant.

Although many of the students said they feared they’d been struck with the same E. coli bacteria that made 52 people in nine states sick this fall, Chipotle officials say they doubt it’s E. coli this time.

RELATED: E. coli outbreak linked to Chipotle expands to 6 states

“Health officials in Boston believe this is likely a norovirus, which seems consistent with the pattern, in our estimation,” Chipotle spokesman Chris Arnold told NBC News.

MSNBC Live with Thomas Roberts, 11/4/15, 2:36 PM ET

E. coli infections jump to 37

CDC Director Dr. Thomas R. Frieden joins Thomas Roberts to discuss Chipotle’s closure of dozens of locations in connection to an E. coli outbreak linked to several stores.
City health officials ordered the outlet closed after an inspection showed the cooked chicken used to make burritos, tacos and other dishes was being kept at too low a temperature, an employee worked while showing signs of illness and because of the reports of possible foodborne illness.

Chipotle said it had voluntarily closed the restaurant in the Brighton section of the city.

“All 80 students have confirmed that they ate at the Chipotle Restaurant in Cleveland Circle during the weekend,” Boston College said in a statement.

“All have been tested for both E. coli and the norovirus. Test results will not be available for at least two days.”

Norovirus is notorious for causing large outbreaks of sickness and it can be spread by a single sick restaurant worker or one sick patron. Simple handwashingis often not enough to prevent its spread.

The Centers for Disease Control and Prevention says it’s still not sure what particular food caused the E. coli outbreak at Chipotle. A separate E. coli outbreak that’s made 19 people sick in seven states was linked to celery sold at Costco, 7-11, King Sooper and other stores.

RELATED: Chipotle to reopen Washington, Oregon outlets after E. Coli outbreak

Symptoms of both illnesses are similar — diarrhea, stomach cramps and fever. But norovirus is far more likely than E. coli to cause vomiting.

Shares of Chipotle slipped $9.98, or 1.8 percent, to $541.77 in midday trading Tuesday. Its shares have fallen about 28 percent from their all-time high of $758.61 achieved in August. 

The Associated Press contributed. This article originally appeared on NBCNews.com.
Explore:

Boston and Chipotle

Chipotle outbreak grows to 80 Boston College students

Updated