Taco Bell customer traffic plunged after a parasite outbreak in the US linked to shredded iceberg lettuce triggered thousands of cyclosporiasis cases in Michigan. Yum Brands shares have fallen sharply, while restaurant chains including Chipotle, Panera, Chopt and Sweetgreen also saw weaker customer visits as the food safety scare spread across the industry.

Federal health officials have identified lettuce from Mexico served at Taco Bell locations across five US states as a source of a widespread outbreak of the diarrhea-causing…

US health officials have identified shredded iceberg lettuce served at Taco Bell restaurants as the source of the infections.

Traffic at Sweetgreen, Chopt and Panera Bread has dipped modestly