A nationwide Cyclospora outbreak, combined with soaring produce costs, has severely strained U. S.
restaurant chains that rely on fresh greens. Customer traffic dropped sharply by late July 2026.
Health officials linked the infection cluster to contaminated iceberg lettuce.
Federal investigators' initial findings connected the intestinal illness outbreak, which began in late June, to shredded iceberg lettuce supplied to Taco Bell locations across Indiana, Kentucky, Michigan, Ohio, and West Virginia.
The Food and Drug Administration subsequently expanded its multi-state investigation to cover Illinois, Kansas, Oklahoma, and Pennsylvania.
In response, Taco Bell voluntarily pulled all Taylor Farms shredded iceberg lettuce from its nationwide stores on July 17.
Customer foot traffic at Taco Bell plummeted 21 percent by July 23, according to tracking data from market research firm Placer.
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Public health experts indicated that the widespread distribution pattern points toward broader systemic supply issues across the commercial produce network.
"As more cases have emerged, it has become clear this is a more complex outbreak," said Craig Hedberg, a food safety expert at the University of Minnesota.
The federal agency expects to identify additional contamination sources as the inquiry continues.
Fallout from the public health scare quickly spread to salad-focused establishments, even those completely unaffiliated with the contaminated shipment.
Foot traffic at Chopt dropped 12 percent by July 23, while weekly sales at Sweetgreen fell roughly 10 percentage points during early July compared to last year.
Sweetgreen, which operates approximately 285 locations across the nation, confirmed that its supply chain remained uncompromised by the health advisory.
"We follow rigorous food safety standards and can trace our ingredients from restaurant to farm," said the company.
The health crisis compounding restaurant operations coincided with steep price spikes across fresh agricultural commodities. Data from the U.
S.
Department of Agriculture showed fresh lettuce prices surged 33 percent year-over-year, following a nearly 20 percent retail hike for iceberg lettuce between January and June.
Grocery prices reflected the surge last week, with iceberg lettuce averaging $1.86 per head—a 25-cent increase from 2025.
Red leaf lettuce climbed 52 cents to $1.66, while romaine hit $2.49 per bunch, marking a $1.55 year-over-year increase.
Agricultural economists attributed the severe market contraction to extreme weather events earlier in the season alongside rising operational overhead for distributors.
Unusually hot temperatures in Arizona accelerated crop maturation, triggering a supply gap before California harvesting commenced in late April, explained Elizabeth Canales, an associate professor of agricultural economics at Mississippi State University.
She added that elevated fuel prices further escalated transport costs due to continuous cold-chain refrigeration requirements.
