Lettuce-linked parasite outbreak in the US hits Taco Bell where it hurts the most

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.