Chipotle Mexican Grill Inc. reported its first fall in quarterly sales at established restaurants since it went public as it lost customers after several incidents of food-borne illnesses at its outlets.

Sales of established restaurants dropped 14.6% in the fourth quarter.

The burrito chain operator’s net income fell to $67.9 million, or $2.17 per share, in the quarter ended Dec. 31 from $121.2 million, or $3.84 per share, last year.

Revenue fell 6.8% to $997.5 million.

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