(Reuters) - Chipotle Mexican Grill Inc
The restaurant in the town of Billerica, outside Boston, was closed for a full cleaning, company spokesman Chris Arnold said, according to Bloomberg.
Chipotle's shares fell 3.8 percent to $504.50 in extended trading.
Arnold said no customers reported falling sick, and the company did not know if employees from the outlet had norovirus, Bloomberg reported.
Arnold was not immediately available for comment.
Chipotle is trying to recover from several food-related illnesses, including two E.Coli outbreaks that sickened about 50 people in 14 states and two separate norovirus outbreaks in Massachusetts and California.
The Massachusetts health department confirmed that the restaurant was closed voluntarily and that no customers were known to be sick, Bloomberg reported.
The department was not immediately available for comment.
(Reporting by Yashaswini Swamynathan in Bengaluru; Editing by Richard Chang)
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