Investors responded to the uncertainty by pulling back from the sector, pushing Sweetgreen shares down 7% in afternoon trading. Chipotle Mexican Grill saw a 3% decline, while Cava Group shares slipped 2%. Yum Brands, the parent company of Taco Bell, also tracked lower as the market reacted to the news.

While the FDA confirmed the case count, the lack of a specific culprit leaves the industry in a state of flux. Cyclospora, a parasite that typically spreads through contaminated produce, often results in prolonged gastrointestinal distress, making the identification of the supply chain breach a critical priority for federal regulators.