parasite

July 20 (UPI) — Taylor Farms said late Sunday the Trump administration mistakenly informed it that a sample of its shredded iceberg lettuce tested positive for a parasite amid a multi-state outbreak that prompted the U.S.-based fresh-produce giant to initiate a recall of the salad staple distributed to 27 states.

The Food and Drug Administration reversed the finding Sunday, determining that the purported positive test for the microscopic Cyclospora parasite, which causes the intestinal illness cyclosporiasis, was a false positive.

“Today, FDA apologized to us,” the company said in a statement.

“Today, we were informed that FDA made a mistake.”

Taylor Farms had initiated the voluntary recall Friday after federal health investigators linked shredded iceberg lettuce sourced from central Mexico to a multi-state cyclosporiasis outbreak through a traceback investigation.

At least 1,644 people in five states have been infected, including 94 hospitalizations, since May 13, according to the U.S. Centers for Disease Control and Prevention, which said there have been no fatalities.

Federal health investigators have linked the illnesses to shredded iceberg lettuce served at Taco Bell locations in Indiana, Kentucky, Michigan, Ohio and West Virginia.

The FDA said Friday that its traceback investigation identified the supplier as Taylor Farms de Mexico. The company then initiated the voluntary recall.

On Saturday, federal investigators said a sample collected during targeted import surveillance tested positive for Cyclospora. The FDA said the produce was not part of the initial recall and investigators were working to identify whether any of the lot was available in commerce.

A day later, Taylor Farms said it was informed of the FDA’s “mistake.”

“To be clear, at this moment, the FDA has not identified a single positive product test result for Cyclospora,” it said.

The FDA told media it had discovered the false positive after rechecking the results of the purported positive sample.

“As of July 19, 2026, there are no confirmed positive sample results for product testing for Cyclospora,” the FDA said in a statement, NBC News reported.

Taylor Farms said it had completed the voluntary recall, which was limited to iceberg lettuce grown and processed in central Mexico, and that all of its other produce is available for purchase.

“Our thoughts remain with everyone who has fallen ill in this outbreak,” it said.

“We are committed to working with public health authorities as the ongoing outbreak investigation continues.”

July 13 (UPI) — More than 2,800 cases of cyclospora infection have been reported, largely concentrated in Michigan, state health officials reported Monday.

Cyclospora is a parasite that is known to cause “explosive” and “watery diarrhea,” stomach pains, loss of appetite, and weight loss. The outbreak comes about one year after the Trump administration cut funding to state and local health department programs focused on foodborne illnesses such as cyclosporiasis.

On Friday, the U.S. Centers for Disease Control and Prevention reported 843 confirmed cases and 1,500 suspected cases of cyclosporiasis across 31 states. There have been 86 hospitalizations, including 44 in Michigan, and no deaths.

“CDC is aware that states are likely to report higher case counts of cyclosporiasis than reflected in CDC data and is working closely with states to update numbers as additional cases are confirmed,” the CDC said in a statement.

The largest concentration of cases has been in Michigan, where about 2,640 suspected cases have been reported. Neighboring Ohio has reported 177 cases. Neither state’s health departments have identified a source for the outbreak.

Dr. Natasha Bagdasarian, chief medical executive for the State of Michigan, said the state’s health department believes the outbreak is most likely related to produce.

As of Thursday, cases have been reported in 43 Michigan’s 83 counties, including 215 in Monroe and 160 in Wayne County.

July 10 (UPI) — The Centers for Disease Control and Prevention on Friday reported that well over 800 cases of a food-borne parasite have been confirmed by 31 states.

CDC officials were working with state and local health agencies to investigate clusters of cyclosporiasis cases in multiple states, some of which the Food and Drug Administration is working to trace and others that have not yet been linked to a common source, the agency said in an update.

Cyclosporiasis is a gastrointestinal disease caused by the parasite cyclospora, which can cause watery diarrhea, loss of appetite and weight loss, and in some cases require hospitalization, according to the CDC.

The parasite can be acquired when people eat or drink contaminated food or water and, although it can be spread year-round, it is considered to be a larger problem during the spring and summer months.

The current series of outbreaks has been tracked since at least mid-June, although the FDA lists its first investigation of cyclospora as staring June 3. With no product linked to the parasite or any other outbreak, the FDA is attempting to trace back to a source.

“Multiple jurisdictions have reported an increase of cases in the last two weeks compared to the same period in 2025,” the CDC said in the update.

“We assume a 6-week reporting lag between illness onset and case reporting to CDC,” the agency said. “Therefore, we anticipate that case counts will continue to rise as data are received.”

The CDC reported that as of July 9, it has confirmed 843 cases of the nationally notifiable disease in 31 states, with 86 hospitalizations, but officials said the agency is aware of at least 1,500 more cases that have not yet been confirmed as domestically acquired in the United States.

Among the states reporting cases and investigations, Michigan on July 4 reported that its confirmed cases increased to 572, a large increase from 170 on June 30.

Cyclospora infects the small intestine after contaminated food or drink is consumed, and symptoms of infection can be seen anywhere from two days to two weeks after exposure.

Overall, the infection is generally not life-threatening, but because of dehydration linked to frequent and sometimes explosive diarrhea — especially in younger or older people, and those with weakened immune systems — it may require hospitalization.

Outbreaks in the United States have previously been linked to bagged salad mixes and kits, fresh cilantro and basil, raspberries, snow peas, and green onions, health officials said.