Lettuce supplier identified as potential source of cyclosporiasis outbreak

Lettuce supplier identified as potential source of cyclosporiasis outbreak

Investigators have identified shredded iceberg lettuce provided by California-based supplier Taylor Farms to Taco Bell restaurants as a potential source of a widespread cyclosporiasis outbreak. The parasitic intestinal infection, which began on May 1, has sickened thousands of people across the United States.

The outbreak is concentrated in Michigan, where health officials reported 4,312 cases as of July 16. Other states reporting large numbers of infections include New York and Ohio. The U.S. Centers for Disease Control and Prevention (CDC) stated this week that it identified a likely link among cases in Kentucky, West Virginia, Ohio, and Michigan, suggesting a common source.

While the U.S. Has seen previous outbreaks of the parasite, health officials are concerned because the scale and geographic spread of this year's event are significantly larger. As of July 16, the CDC reports 1,645 confirmed cases across 34 states, including 141 hospitalizations. An additional 5,100 cases are currently being reviewed by CDC officials for potential links to the outbreak.

Corporate and Government Response

Taco Bell stated earlier this week that it removed a limited number of ingredients from some restaurants as a precaution. The company emphasized that health authorities have not confirmed a link to the chain, any specific supplier, or any particular food item.

"The health and safety of our guests is our top priority. Public health officials have not confirmed a link to Taco Bell or any specific ingredient, supplier, restaurant or retailer,"

Taco Bell Corp, via Newsweek

Despite the company's stance, some Taco Bell locations in the Detroit region posted notices stating they were unable to sell guacamole, pico de gallo, cilantro onion, and lettuce due to a nationwide recall. Bloomberg News reported that the U.S. Food and Drug Administration (FDA) is expected to soon advise consumers in Indiana, Kentucky, West Virginia, Ohio, and Michigan to avoid shredded lettuce at Taco Bell.

White House press secretary Karoline Leavitt stated in a Thursday press briefing that the White House is monitoring the situation and "has a handle on the situation." She encouraged the public to follow FDA and CDC food safety guidance.

Market and Consumer Impact

The outbreak has triggered a decline in foot traffic at "lettuce-heavy" restaurant chains. Placer.ai data shows that on Sunday, July 11, traffic at Panera Bread fell 7.4 percent and Chopt fell 7.1 percent compared to their 2026 Sunday averages. Sweetgreen saw a 3.1 percent decline. In contrast, quick-service chains such as Wendy's, Chick-fil-A, and McDonald's saw traffic increase by 0.8 percent.

Financial markets have reacted to the news. Over a five-day period, shares of Sweetgreen dropped 23.3 percent, and shares of Yum Brands, the parent company of Taco Bell, fell 7.2 percent. Taco Bell's overall foot traffic was down 5.8 percent on July 11, with a steeper 11.5 percent decline in Michigan.

Industry Safety Measures

As consumers grow wary of leafy greens, some producers are distancing themselves from the outbreak. Gotham Greens, based in New York City, stated on social media that its salad kits, basil, and lettuce are safe because they are grown in controlled greenhouse environments.

Little Leaf Farms, a Massachusetts-based company, similarly asserted that its products are not impacted. Paul Sellew, CEO and founder of Little Leaf Farms, told Newsweek that Controlled Environment Agriculture (CEA) brands are the safest choice because they use closed systems with regulated nutrients, light, and humidity, and disinfect all water via ultraviolet (UV) sterilization.

Understanding Cyclosporiasis

Cyclosporiasis is caused by the Cyclospora cayetanensis parasite, which originates from human fecal contamination. The parasite enters the food supply when produce is exposed to unsanitary conditions or contaminated water during processing, harvesting, or growing. Because items like herbs, lettuce, and berries are typically eaten raw, they are particularly vulnerable.

The illness is characterized by:

• Watery, sometimes "explosive" diarrhea
• Nausea, bloating, and abdominal cramping
• Fatigue, loss of appetite, and weight loss
• Occasional vomiting or low-grade fever

Symptoms can be relapsing and last for weeks without treatment. The standard treatment involves the antibiotic trimethoprim-sulfamethoxazole, often sold as Bactrim, alongside electrolyte replacement and fluids to prevent dehydration.

Health officials note that heat inactivates the parasite, making cooked vegetables and fruits safe. Produce with thick, removable peels is generally considered safer.