Science
How to eat safely amid outbreak of diarrhea-causing cyclosporiasis
Thousands of people across 34 states are experiencing explosive and prolonged diarrhea due to a food and water-borne parasitic disease that has prompted experts to urge people to take extra precautions when preparing food.
A specific type of produce, grower or supplier has not been identified as the source of each state’s outbreak; officials say there could be multiple sources.
At the epicenter of the cyclosporiasis outbreak in Michigan, where more than 3,700 residents have been infected, public health experts say a possible culprit under investigation is leafy greens.
Some Taco Bell locations in Michigan are also being investigated after the chain voluntarily stopped selling lettuce, cilantro, onion, pico de gallo and guacamole, “due to a nationwide recall.”
Even though the clusters of outbreaks are concentrated in the Midwest and East Coast, epidemiological and infection prevention experts urge people in California and the rest of the U.S. to be cautious with their produce and take the necessary steps to reduce their risk of infection.
California has reported 41 cases of cyclosporiasis, between January and June, none of which are linked to the current outbreak. That is below the average of 100 cases reported annually in California, usually between May and August, said Robert Barsanti, spokesperson for the California Department of Public Health.
“It’s important to understand that California experiences cases of cyclosporiasis every year, with a majority of cases acquired internationally,” said Erica Pan, director of the state agency. “Cases for 2026 are well within expected ranges for California.”
Rising cyclosporiasis cases shouldn’t deter Californians from eating fruits and vegetables. Instead, experts say, it’s a call to take extra precautions to reduce the risk of contracting the parasitic disease.
Which produce are potential sources of cyclosporiasis
In the U.S., food-borne outbreaks of cyclosporiasis have been linked to various types of fresh produce imported from Latin America, including raspberries, cilantro, basil, snow peas and mixed salad, according to the California Department of Public Health.
One of the largest cyclosporiasis outbreaks in North America was linked to imported raspberries from Guatemalan farms in 1996, said Dana Mordue, associate professor of pathology, microbiology and immunology with New York Medical College.
At the time, more than 1,400 cases of the disease were reported in 20 states, the District of Columbia and Canada.
How to reduce your risk of contracting cyclosporiasis
The first step is to wash your hands with soap and water before handling produce.
Then, experts say:
- Wash all fruits and vegetables thoroughly under running water before eating, cutting or cooking.
- Remove and discard outer leaves from lettuce and leafy greens.
- Cook vegetables and herbs whenever practical, especially for vulnerable populations including young children, pregnant women and immunocompromised individuals.
- Prevent cross-contamination: Use clean cutting boards, utensils and food-contact surfaces. Keep ready-to-eat foods separate from raw produce during preparation.
- Refrigerate cut, peeled or cooked fruits and vegetables as soon as possible (within two hours).
- Avoid food or water that may be contaminated by human feces, especially when traveling to countries where tap water or food may be unsafe.
If your produce comes in a package that says “pre-rinsed,” experts say you should still take the time to rinse it yourself.
Will a simple rinse of all types of fruits and veggies reduce my risk?
Some fruits and vegetables should be rinsed and others scrubbed, depending on the type of produce, said Britanny Saunier, executive director with the Partnership for Food Safety Education, a nonprofit that develops and promotes food safety material to reduce food-borne illness.
All types of produce should be rinsed under running water, including those with skins or rinds that are not eaten.
“We recommend an extra step for those firm-skinned fruits and vegetables — such as a cucumber or melon — which should be rubbed by hand or scrubbed with a clean brush while rinsing under running tap water, Saunier said.
You should dry your cleaned produce with a clean cloth or paper towel.
Some supermarkets offer “produce washes,” usually provided in spray bottles, which claim to break down surface waxes and remove dirt, pesticide residues and harmful bacteria. But the U.S. Food and Drug Administration does not recommend them because the safety of their residues has not been evaluated, she said.
“Many types of fresh produce are porous and could absorb these products, potentially changing their safety and taste,” Saunier added.
Rinsing and scrubbing is the most effective method of lessening your risk of contracting the disease but it doesn’t eliminate it entirely, Mordue said.
That’s because the parasite has a tough outer shell, making it difficult to eliminate, said Dr. Norman Beatty, associate professor of medicine with the Division of Infectious Diseases & Global Medicine at the University of Florida College of Medicine.
The parasites’ cell walls are “highly resistant to adverse environmental pressures and traditional disinfectants,” Beatty said.
In general, the parasite has been found in soil and from there it sticks to produce, likely due to the use of contaminated water or inadequate hygiene among food handlers, she said.
“It is unclear how to safely remove these [parasites] from produce once they have contaminated soil or plant matter, but merely washing with water is likely not to remove them prior to eating,” Beatty said.
Are there any types of produce I should avoid entirely?
Because lettuce and bagged salad greens have been identified as potential sources of the outbreak in Michigan, Mordue said she would be cautious with bagged leafy greens.
As a resident of New York, one of the states currently reporting an outbreak, Mordue said she has a bag of packaged greens in her fridge that she plans to toss in the trash.
The advice for Californians might be slightly different since the state isn’t reporting an outbreak. Rinsing leafy greens before serving them is fine, Mordue said. But if you can do without them for the time being, she said, avoid them.
In the case of packaged spinach, cooking the leaves can reduce your risk of contracting cyclosporiasis.
How does this type of outbreak end?
It’s difficult to say when an outbreak might end until the source of the parasitic disease is identified.
When local and federal public health officials, “zero in on a specific causative agent, they can end it pretty quickly,” Mordue said.
Once a source is identified, she said, a recall notice will be issued for the contaminated produce and people will know exactly what they shouldn’t eat.
“The sooner they can figure it out, the sooner it’s going to end,” Mordue said. “That said, if they cannot figure out the source this could go on for a while.”
What are the symptoms and remedies for cyclosporiasis?
Someone who contracts the parasite might end up with week-long watery and explosive diarrhea, “which is bad enough,” she said.
Other symptoms include loss of appetite, weight loss, cramping, bloating, increased gas, nausea and fatigue.
If you start to have debilitating diarrhea and feel fatigue, experts urge you to seek medical care.
Medical providers will likely test a stool sample to determine whether you’ve contracted cyclosporiasis and treat you with an antibiotic called Bactrim, among other treatments.
Science
Bonta accuses DuPont of corporate shell game to dodge PFAS cleanup in California
California Atty. Gen. Rob Bonta filed a complaint Thursday alleging that a cohort of the companies that make “forever chemicals” partook in a massive corporate shell game to defraud the state and others.
In an amendment to a 2022 lawsuit filed by Bonta against the makers of these chemicals, the state now alleges that several DuPont spin-off companies — New DuPont, Corteva, Chemours and Qnity Electronics — worked together to create a “fall guy” company designed to take the financial hit stemming from several multibillion-dollar pollution lawsuits while keeping the companies’ most valuable assets out of reach.
“The DuPont Defendants cannot game the system by illegally moving assets out of reach, dodging liabilities for the harm they have caused, and calling it restructuring,” Bonta said in a statement. “I look forward to ensuring that these companies are held accountable for PFAS pollution and that their assets cannot be hidden behind corporate walls while their responsibilities are left behind.”
The Second Amended Complaint, as the new amendment is called, was filed in U.S. District Court for the District of South Carolina on Thursday.
DuPont did not respond to multiple requests for comment.
In 2022, Bonta sued 20 chemical manufacturers, including 3M and DuPont, alleging the companies knew about the dangers of perfluoroalkyl and polyfluoroalkyl substances — or PFAS — when they made and/or sold products containing them. The suit also claims the companies failed to warn the public about the environmental and health risks of those chemicals and in many cases concealed the risks.
That lawsuit remains active and ongoing.
PFAS chemicals are found in a variety of consumer items, including food packaging and cookware, and are linked to cancer and other illnesses and health risks such as developmental defects, infertility and reduced bone density in children.
They are resistant to environmental degradation, according to the Centers for Disease Control and Prevention, the Environmental Protection Agency and hundreds of scientific studies. They have also been found in the bloodstreams of 98% of people tested, as well as in wildlife, fish, water — including rivers, lakes and nearshore waters — and soil.
Data from the State Water Resources Control Board show PFAS chemicals are in drinking, ground and surface waters in the state. They’ve been detected in at least 146 public water systems serving 16 million Californians, as well as in aquifers that provide millions of Californians with water through unregulated domestic wells.
According to a news release from Bonta’s office, the fraudulent DuPont scheme worked like this: By 2013, the original, “Old” DuPont company knew it faced billions of dollars in environmental cleanup costs and legal damages due to its PFAS products. To protect its assets and make itself appealing for a merger with industry giant Dow Chemical, the Old Dupont company initiated a multi-phase restructuring plan, which it called “Project Beta.”
Bonta referred to the original DuPont company as “Old Dupont” and a newer version as “New DuPont” in his filing.
It started with the creation of a company called Chemours, which the Old DuPont company spun off in 2015. The Old DuPont company transferred its PFAS business to this new company and extracted almost $7 billion in cash, stocks and notes from the new company. The new company was also forced to assume all of Old DuPont’s historical PFAS liabilities and sign an agreement to indemnify Old DuPont against them.
Bonta claims this was a sham transaction, leaving Chemours holding the liability bag with no way to pay the environmental debts it would incur should the courts come calling.
Old DuPont merged with Dow Chemical in 2015, and according to Bonta’s claim, the new company, DowDuPont, was again structured in a way that would protect the new company from any remaining PFAS liabilities.
In 2019, the company went through another reshuffling. A “New” Dow was created, which took the materials science assets, as well as a company called Corteva, which took the company’s agricultural businesses. A New DuPont company was also formed.
During this same year, Chemours sued the other DuPont companies, claiming it had been handed a financial time bomb because of the PFAS liability it had been left with. The company alleged the 2015 deal was a sham that set them up for bankruptcy.
In 2021, the companies sat down to resolve the lawsuit. Chemours agreed to drop the lawsuit and waive its right to sue. In exchange, Corteva and New DuPont agreed to split the costs of future PFAS liabilities with Chemours 50/50 — but only up to $4 billion.
Bonta alleges that $4 billion was a gross underestimate of the potential legal damages they were likely to face. The result of the agreement would have capped Corteva and New DuPont’s liability at $2 billion and saddled Chemours with any and everything else — a number he claims is likely to far exceed $2 billion.
Chemours also had insurance policies that would have helped pay for the PFAS lawsuits. However, Bonta alleges that Chemours sold 100% of those insurance payouts back to its sister companies in 2025 for a lump sum of cash that was worth less than half of what the insurance was actually valued at.
By transferring away its best assets (the insurance) while keeping the massive debt, Chemours was hollowed out so it can’t pay its potential creditors, including California.
To further protect their wealth, New DuPont is accused of continuing to chop up its remaining valuable businesses and separating them. For example, the court filing claims they took their profitable electronics business and turned it into a totally separate, independent company called Qnity.
Bonta claims these restructuring moves violate the Uniform Fraudulent Transfer Act and the Uniform Voidable Transactions Act. He is asking the court to stop the companies from selling, spending or moving any more assets or profits that belonged to the original, or Old DuPont company, in order to ensure that California gets its payout if the chemical companies lose the lawsuit.
“Ultimately, the question is whether courts will ‘pierce the corporate veil’ to allow California and other plaintiffs to hold new Dupont and other breakout companies liable,” Albert Lin, a law professor at UC Davis, said in an email.
“Courts are willing to pierce the corporate veil if spinoff companies are created to engage in fraud or wrongdoing or to evade legal obligations,” he said. “Allegations that Dupont undercapitalized or underinsured Chemours and other entities can support veil piercing.”
Science
California’s cyclosporiasis cases are ‘higher than expected,’ but officials aren’t sure why
California is reporting more cases of cyclosporiasis than it would on average for this point in the summer, including two recent cases where residents ate at out-of-state Taco Bell restaurants, according to state health officials and data.
Despite the uptick, officials say California is not included in the cyclosporiasis outbreak that’s hit 15 states, sickening tens of thousands of people with prolonged bouts of diarrhea.
However, officials with the California Department of Public Health told The Times the number of cases is “now higher than what we might expect for this point in the season.”
Latest cyclosporiasis case breakdown in California
California’s cyclosporiasis data now includes probable cases — meaning an ill person showed signs and symptoms of the parasite but the case lacks laboratory confirmation — as well as internationally acquired cases, significantly increasing the state’s case count from previous estimates in June.
Between Jan. 1 and July 15, there were 201 confirmed and probable cyclosporiasis cases in California, the state health department reported.
Of the total number of cases, 39 were domestically acquired, meaning these infected people became ill either in the state or after traveling within the United States.
The rest became ill after traveling internationally, it’s unclear where the sick individuals had traveled to.
“To date, CDPH is aware of 2 cases that traveled to an affected state, ate food at a Taco Bell location and are determined by CDC to be linked to the outbreak,” the agency stated. Because the parasitic disease was contracted from contaminated produce out of state, California is not counted as being a part of the current outbreak.
Of the 201 confirmed and probable cases in California, 11 people were hospitalized, officials said.
There have been no deaths in relation to the California cases of cyclosporiasis.
Why cases in California have gone up
Public health officials are working with local health departments to actively monitor cyclosporiasis cases statewide to determine if there are potential outbreaks here, and identify a possible cause for the increase in cases.
The agency said the high number of cyclosporiasis cases could be attributed to:
- Cyclosporiasis receiving recent, national attention due to the multi-state outbreak. “This has led to increased awareness of the illness in California and nationwide, which has likely led to increased testing for the illness,” the Department of Public Health stated. “We may be identifying more cases than we have in previous years.”
- Overall improvements to the department’s surveillance and data collection methods.
- An increase in cases in travelers to areas with cyclosporiasis outbreaks, whether international or domestic.
What’s happening in the multi-state outbreak
To date, 15 states have reported high numbers of cyclosporiasis cases; the epicenter continues to be in Michigan, whose state public health department has reported more than 12,400 sickened residents, 279 hospitalizations and two deaths.
The two patients who died may have had underlying health conditions that made them particularly vulnerable to the gastrointestinal illness and dehydration that can come with the disease, Michigan public health officials said.
According to the Centers for Disease Control and Prevention, cyclosporiasis is rarely fatal.
On Thursday, Michigan officials said the state’s data now suggests that, “new cyclosporiasis case reports are slowing, including a downward trend in diarrhea-related emergency department visits.”
On average, people exposed to cyclosporiasis — typically through contaminated food or water — start to feel sick seven days after exposure, but symptoms can take up to 14 days to appear.
Given the weeklong average incubation period, Michigan data suggests that:
- Most exposures occurred in late June to early July.
- The majority of the contaminated produce is likely no longer available for consumption.
The outbreak, which began in May, has affected tens of thousands of people who reported feeling ill after eating Taco Bell products with shredded lettuce.
Traceback and outbreak data have linked the shredded iceberg lettuce supplied to the Taco Bell locations to the Salinas-based company Taylor Farms and its Taylor Farms de Mexico facility in Central Mexico.
The company, also known as Taylor Fresh Foods, announced last month it was voluntarily recalling various products including chopped lettuce, shredded lettuce, blends of iceberg, romaine lettuce and salad mixes that were supplied to restaurants and retailers in 27 states.
Since May 1, the CDC has laboratory-confirmed 10,468 domestic cases of cyclosporiasis and is aware of more than 12,255 additional cases that have yet to be laboratory confirmed.
Officials say the true number of cases is likely higher because some people recover without medical care and are not tested for the parasite.
Science
Tiny toad, big discovery: New ice age amphibian found in La Brea Tar Pits collection
Researchers in Los Angeles have made a ribbiting new discovery at the La Brea Tar Pits and Museum — an extinct amphibian from the ice age.
The spadefoot toad, or Spea labreae, is one of only two ice age amphibians to have been found in the U.S. The other is an extinct species of tree frog in Florida, known as Hyla baderi, according to the museum.
“While the toad may be much smaller than the mammoths and saber-toothed cats that made the Tar Pits famous, this discovery has a big impact on our understanding of the climate at the end of the last ice age,” the news release read.
The discovery of the spadefoot toad was made two years ago but published recently in the Journal of Vertebrate Paleontology and marks one of several discoveries made at the Samuel Oschin Global Center for Ice Age Research at the La Brea Tar Pits, where the museum is undergoing renovation.
Unearthing the spadefoot toad wasn’t the result of a targeted search — it happened by accident, much like many of history’s greatest finds.
Dr. Alberto Cruz, the lead author, was reviewing the rarely studied collections of amphibians and reptiles as a postdoctoral fellow at the La Brea Tar Pits when he noticed an amphibian that looked different from the others.
At first glance, he thought he was looking at a specimen that had been sick or injured rather than a new species. Upon closer inspection, he realized that wasn’t the case.
This incomplete sacro-urostyle bone (base of the spine that connects to the hips) is the holotype specimen used to describe the new species, Spea labreae.
(La Brea Tar Pits)
To identify the spadefoot toad, Cruz said he examined the bones of amphibians found at the Tar Pits, a collection that hadn’t been analyzed in nearly 30 years. He then compared the collection with the 80 specimens at the Herpetology Collection at the Los Angeles County Natural History Museum and the Museum of Vertebrate Zoology at the University of Berkeley.
“I thought: ‘Oh my gosh, this is a new species,’” he said. “This material is originally from the 1950s, but when you study it again, you can find gold in these specimens. It’s very cool.”
Researchers say amphibians provide a window into the past because they don’t travel far during their lifetimes and are sensitive to climate change. When their fossils are discovered, it helps scientists piece together how local environments changed over time.
“If you change the environment, you change the vegetation, the climate is warmer or colder, it affects these animals directly,” Cruz said.
The miracle behind Cruz’s discovery is that amphibians such as frogs, toads and salamanders rarely make it into the fossil records because of their fragile skeletons.
Emily Lindsey, curator and excavation site director at the La Brea Tar Pits’ center, said the discovery of the ice age toad is an example of the ongoing discoveries being made at the museum.
“There’s definitely more to come,” she said.
Also detailed in the Journal of Vertebrate Paleontology is the first record of another amphibian: the Mexican burrowing toad —Rhinophrynus. The species, which still exists, once inhabited the Southwestern region including Los Angeles. Researchers note that its closest known population is now roughly 1,550 miles away in southern Mexico.
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