Science
Antelope Valley residents say they are fed up with rampant dumping, official inaction
Eric Eller likes to ride his dirt bikes through the canyons, dry riverbeds and rocky outcroppings of the Antelope Valley in the high desert north of Los Angeles.
Eller’s an off-the-grid kind of guy with a “Mad Max” vibe — living in a house on a remote plot of land next to a jury-rigged trailer where he tinkers with the remnants and pieces of gutted automobiles, motorcycles and other mechanical debris.
But Eller’s isolation was obliterated last June when dozens of big dump trucks began snaking up the dirt road behind his house and discarding their loads into the nearby dry river canyon. The caravan of waste-haulers continued in the days that followed, often arriving after sundown or in the dark hours before dawn.
Two months later, the convoys abruptly stopped. But not before the makeshift dump’s surface had been camouflaged with dirt and mulch — much of which has since blown away, revealing a 30-foot-deep noxious stew of chopped-up concrete, plastic tampon applicators, faded plastic children’s toys, toothbrushes, syringes, empty caulking tubes, two-by-fours, faded books, weathered Styrofoam pipe insulation, plastic bucket tops and more.
EL MIRAGE, CA – APRIL 18: A truck leaves the Circle Green mulch dump site near El Mirage on Friday, April 18, 2025. (Myung J. Chun / Los Angeles Times)
Across the Antelope Valley, waste trucks are hauling garbage in from the Greater Los Angeles area and Central Valley towns such as Bakersfield, and then dumping it at makeshift sites. Letters, bills and envelopes visible at several of these waste sites in April showed addresses in Pacoima, Los Angeles and Van Nuys, among other cities.
“Illegal dumping has been a problem in the Antelope Valley for decades,” said Chuck Bostwick, a senior field deputy for Los Angeles County Supervisor Kathryn Barger, who represents much of the area. “But it’s gotten worse in the last two or three years, markedly worse.”
In some cases, such as the site behind Eller’s home, the waste sites are flat-out unauthorized. No landowner has given permission to dump at the site, and the waste consists of construction, household and medical debris.
But in others cases, the waste-haulers have the landowners’ permission to dump — but are disposing waste that should be going to landfills equipped to handle household and industrial waste, lawsuits claim.
In one lawsuit filed in U.S. District Court in Los Angeles, residents claim that major residential waste-hauling companies including Athens Services, California Waste Services and Universal Waste Systems are dumping hazardous substances without authorization.
The suit claims these companies are disguising the construction and demolition debris as “green waste by unlawfully covering this waste with highly flammable wood chips and other organic waste.”
Eric Casper, the president of California Waste Services, said in an email that his company has “never engaged in dumping waste of any kind, at any time, in the Antelope Valley — legal or illegal. Nor anywhere else.”
A sneaker among the trash dumped at Adobe Mountain near Lancaster, CA. Locals say this was a canyon before it was filled in to hold trash. Photographed on Friday, April 18, 2025.
Athens Services also denied any illegal dumping, saying in a statement that California’s organics recycling law “encourages sending compostable material to third parties such as farmers and other property owners for beneficial use. This is the material that Athens Services produces and distributes.”
Universal Waste Systems and other companies named in the suit didn’t respond to requests for comment, nor have they filed responses to the federal suit.
Residents say there are more than 100 dump sites scattered throughout the valley — from Lake Los Angeles to the Antelope Valley California Poppy Reserve and north to Mojave — that they contend are unauthorized.
Some of these sites cover hundreds of acres and extend dozens of feet deep. And residents worry that what they can see — from the roads or their homes — is just the tip of a malodorous and malignant iceberg, and that there are probably dozens more they haven’t yet identified.
They complain they are plagued by the toxic, sour and rotten-egg like smells emanating from the discarded trash that cooks in the hot sun and then wafts across their properties.
They also note that the flammable mulch and other materials in the dump, combined with a broiling desert sun, makes for an acute fire risk.
Between 2020 and 2024, the Los Angeles County Fire Department responded to 42 mulch or trash-related fires in the Antelope Valley, ranging from a quarter-acre to 22 acres, ultimately costing taxpayers roughly $1.6 million to extinguish, according to Los Angeles County documents.
Ashley Mroz, who lives in the Antelope Valley community of Neenach, said a mulch-covered dump site spontaneously combusted near her home last summer.
“It had been smoldering for days and days,” said Mroz, one of the plaintiffs in the federal court suit. “We could not even go outside. The smell was so horrific.”
Trash dumped at Adobe Mountain near Lancaster, CA. Locals say this was a canyon before it was filled in to hold trash. Photographed on Friday, April 18, 2025.
And the scourge has spread beyond the dump sites: Shredded plastic debris can be seen hanging from roadside Joshua trees and creosote bushes. While a midday view across the arid landscape reveals a sea of glimmering, reflective glass shards, like the tips of cresting waves over a vast, brown ocean.
According to Antelope Valley residents and the federal suit, property owners in some cases have given permission — and received payments for — waste to be dumped on their land. Not only do these sites pose a nuisance to the neighbors who live adjacent to or near them, in some cases the material being dumped includes industrial and household waste that can leach into the groundwater.
In its statement, Athens pointed out that property owners sometimes give permission to accept material from multiple waste companies.
“To the extent there are any instances of noncompliant material, we are confident the evidence will demonstrate that it came from another source,” Athens said.
Encounter in Adelanto
On a blustery day in April in the high desert town of Adelanto, local residents watched as two dump trucks offloaded their waste into a San Bernardino county-certified organic waste dump site that is surrounded by eight- to 10-foot high berms of mulch-like waste laced with shredded plastic, insulated wires and chopped-up, plastic children’s toys.
Through a break in the berm, the residents could see that the ground around the recently dumped haul glittered in the sunlight with broken glass, while stalks of what appeared to be insulated wires and rigid plastic stood sentry across the 138-acre expanse.
Two men sitting in a silver GMC pickup truck who were watching the disposal drove over to the gawking residents.
When the residents asked who they were and what the trucks were dumping, the men declined to answer and referred questions to the owner of the property, which The Times later determined to be Kevin Sutton, the owner of a company called Circle Green Inc. Sutton didn’t respond to requests for comment.
As neighbors and a Times reporter and photographer drove away from the site, the silver pickup followed for several miles, tailgating and swerving erratically. The truck turned around only when the small caravan came across a handful of heavily armed California Fish and Game law enforcement agents parked alongside the road.
“It’s the Wild West out here,” said Kristina Brown, a Lancaster property owner who is a party to the federal suit.
A convenient dumping ground
The Antelope Valley’s proximity to Los Angeles and its vast stretches of wild desert make it a prime target for unauthorized dumping.
Sitting at roughly 3,000 feet above sea level, and surrounded by the Tehachapi, Sierra Pelona and San Gabriel mountains, the valley is also divided by jurisdiction — with Los Angeles, Kern and San Bernardino counties all claiming some territory.
“For decades, our illegal dumping was small-time stuff,” said Bostwick, Supervisor Barger’s field deputy. “It was somebody who had a sofa they couldn’t be bothered to take to the dump or they didn’t want to pay, so they dumped it out in the desert. There was commercial dumping then, but it was small time as well.”
But then the state’s waste laws changed, he said.
Starting in 1989, California began requiring municipalities to divert 50% of their waste away from landfill and toward more sustainable waste management solutions, such as recycling and compost. And as Bostwick noted, the vast open spaces of the Antelope Valley beckoned.
In 2022, lawmakers implemented Senate Bill 1383, which initially mandated the diversion of 50% of all food and organic waste away from landfills, but increased to 75% on Jan. 1, 2025. Another 2020 law closed a loophole that had allowed waste companies to dump green waste in landfill, but not have it counted against them. As a result, the need for dumping grounds increased again.
Cities, counties and towns that fail to meet the diversion rates risk fines of up to $10,000 a day.
Mounds of dumped loads at this location south of E. Avenue M in Lake Los Angeles. The mounds contain mulch, trash and construction debris. The site was found by a resident who followed a truck onto the dirt roads. Photographed on Friday, April 18, 2025.
Residents, lawmakers and experts say while the spirit of these laws is noble, in many areas of the state, the infrastructure to handle the diverted waste is lacking — especially in Southern California, where there is not nearly enough farmland or water to handle the increased volumes of green waste leaving the region’s cities and suburbs.
As a result, waste companies and haulers — trying to keep costs down and maintain city contracts — are tempted to dump the waste wherever they can, while local governments are reluctant to crack down on violations, Bostwick said.
State regulations have made “disposal much more expensive and hard to deal with, and so that’s increased the financial incentives for companies or individuals to just dump illegally,” he said.
There’s also very little enforcement.
According to Los Angeles County data, while taxpayers spent roughly $1.3 million between 2017 and 2018 to mitigate illegal waste disposal in the region, that number jumped nearly fourfold in 2022-2023, when taxpayers had to foot $4.46 million to mitigate the problem.
At the same time, the number of cases filed with the Environmental Crimes Division of the district attorney’s office decreased from 15 in 2019 to three in 2023.
In February, CalRecycle, the state’s waste agency, finalized emergency orders they say should empower local law enforcement agencies to stop the illegal disposal. Previous regulations only allowed for action against the owner of land where the disposal was occurring. The new orders allow enforcement officials to target parties that are dumping the materials and the facilities that provided the material.
The orders came after officials from the state agency came to visit the area in October 2024 — prodded by Brown, Mroz and other local residents, many of whom have spent years calling state and local officials about the problem.
Enforcement of these orders, however, is the responsibility of the county, said Lance Klug, a spokesman for the state waste agency.
“Local enforcement agencies can best speak to their enforcement actions to date, and any anticipated next steps, now that emergency regulations are in effect,” he said.
The Los Angeles County Board of Supervisors adopted a measure last year requiring mulch suppliers to take back any contaminated or illegal waste dumped on private land. The measure, which was sponsored by Barger, also directed county agencies to require “stringent record keeping for all land application operations regarding the origin of all incoming loads and testing results from all mulch suppliers.”
County officials couldn’t immediately provide numbers recently when asked how many enforcement actions had been taken.
“There’s literally no enforcement,” said Brown, who worries that the situation is only going to get worse.
Last month, Eller was riding his dirt bike when he stumbled upon a 60-acre expanse of freshly dumped construction debris, medical waste and compost on a plot of land miles away from any major road.
The tire marks from dump trucks hadn’t yet been blown away by the incessant gales of the high desert. No fences or berms were erected to contain the site, making it impossible to see from the road or along the horizon.
He said it feels like they are living in a real-life game of whack-a-mole: As soon as he and his neighbors identify and report one site, the haulers move onto another.
And they say they feel abandoned by regulators, who they say are doing nothing to stop it.
“It feels like we’re screaming into the wind,” Brown said.
Science
How Rising Home Insurance Costs Are Linked to Credit Scores
Two friends bought nearly identical homes last year, in the same northern Minnesota neighborhood, for the same price.
But Tara Novak pays more than twice as much for home insurance as Petra Rodriguez. The only difference? Ms. Novak has a lower credit score.
Across the country, people with weaker credit histories are paying far more for home insurance than owners with spotless records.
Where the home insurance rate gap between “fair” and “excellent” credit is higher
Home insurance premiums have risen rapidly in recent years, fueled by climate change, building costs and inflation. The price shock has rippled into the real estate market, dragging down home prices in areas vulnerable to disasters and leading insurers to abandon homeowners in risky places.
But these dynamics obscure another problem: The home insurance market has cleaved in two along a boundary defined more by a customer’s personal history than by the risk of a disaster hitting their home.
Americans with weaker credit histories, usually from missed payments or high amounts of debt, now pay significantly more for insurance, regardless of where they live, two new studies have found. While those with poor credit histories often can’t purchase homes at all, people with “fair” scores, which range from around 580 to 669, are paying twice as much in some places as people with “excellent” scores of about 800 or higher. And the gap is growing.
Insurers use a metric based on credit history known as an insurance score to set rates, and the figure tracks closely with a customer’s credit score.
The penalty for having a “fair” credit history versus an “excellent” one
States with the biggest pricing gaps
That can mean owners of identical homes, like Ms. Novak and Ms. Rodriguez, pay wildly different rates to insure them. For most people, it’s now just as expensive to have a credit score of “fair” as it is to live in an area likely to experience a disaster like a hurricane or wildfire. About 29 percent of consumers have credit scores that are categorized as “fair” or “poor.”
“There’s so many reasons people have bad credit,” Ms. Novak said. “It’s not like I’ve ever not paid a bill on time. I’m a stickler on my bills, I’m a stickler on my rent, never been late. This is not fair.”
“The choice to use credit scores in pricing means that those lower-credit home owners in risky areas are effectively subsidizing more affluent high-credit homeowners who also live in risky areas,” said Nick Graetz, assistant professor of sociology at the University for Minnesota, who wrote one of the recent papers. “So in a lot of ways, you can keep your insurance price down if you’re high income, high credit — even if you live on the coast of Florida.”
A handful of states have banned insurers from using credit data because of concerns about fairness and the potential for discrimination against low-income people and people of color, but the majority allow it.
For those with both weaker credit and high disaster risk, the combination can set them up for a downward spiral: disasters tend to be followed by decreases in credit scores as people use credit cards and bank loans to recover. That can lead to higher insurance rates, pushing monthly housing costs further out of reach.
“When a disaster hits, there’s a loss of income that occurs, and then that can impact someone’s credit score because they can’t pay their debt, they can’t pay their rent, they can’t pay their mortgage,” said Lance Triggs, executive vice president at Operation HOPE, a financial literacy nonprofit. “And now they’re faced with higher insurance premiums post-disaster.”
A working paper released today by the National Bureau of Economic Research found that homeowners with the lowest credit scores paid, on average, $550 more in 2024 for home insurance than those with the highest scores.
The findings broadly track with data from Quadrant Information Services analyzed by The New York Times, which found that, on average, lower credit scores meant higher premiums across every state that allowed the practice. Dr. Graetz used the same data set for his research, which he did in collaboration with the Consumer Federation of America and the Climate and Community Institute.
When a windstorm last year hit the home of Audrey Thayer, a city council member in Bemidji, Minn., it ripped the siding off her house and stripped shingles from her roof.
Ms. Thayer’s insurance did not cover all the damage. As she fought her insurer for more money, she opened new credit cards and bank loans to repair her home. Her credit score dropped as she tried to find a new insurance plan.
Ms. Thayer, a member of the White Earth Nation, said she was not aware that her credit score could affect her home insurance rates, even though she teaches about credit ratings at a nearby tribal college. “Most of the folks here do not have good credit,” said Ms. Thayer, whose community is one of the poorest in the state. “I did not know what a credit score was until I was 35 or so.”
In Texas, the advocacy group Texas Appleseed found that some insurers charge people with poor credit up to 12 times as much as people with excellent credit for certain policies, said Ann Baddour, the director of the nonprofit’s Fair Financial Services Project.
Higher costs have serious implications for low-income homeowners who live in the path of hurricanes, said Nadia Erosa, the operations manager at Come Dream Come Build, a nonprofit community housing development organization. After the Brownsville, Texas, region saw intense flooding last spring, some residents turned to companies offering high-interest loans to fund repairs, she said, raising the risk of the disaster-credit spiral.
“Delinquencies are going up because people cannot afford their payment,” she said.
The price of risk
Before they can get a mortgage, homebuyers are usually required by lenders to purchase home insurance.
“Households with insurance have fewer financial burdens, fewer unmet needs, they recover faster, they’re more likely to rebuild,” said Carolyn Kousky, an economist and founder of Insurance for Good, a nonprofit that focuses on finding new approaches to risk management. “Yet the people who need insurance the most are the least able to afford it.”
Insurance companies consider a variety of factors when setting the premium for a property. They might examine the age of the roof, or the area’s vulnerability to hurricanes or wildfires. They factor in how much it would cost to rebuild the house if it were damaged.
Insurers have argued that credit history is also worth considering because people with low scores tend to file more claims than those with excellent scores, an assertion that is backed up by the working paper published in the National Bureau of Economic Research today. This likely happens because people with weaker credit histories tend to have less income, and when their home is damaged, they file insurance claims for smaller fixes that a wealthier homeowner might pay for out of pocket.
Paul Tetrault, senior director at the American Property Casualty Insurance Association, a trade organization, said credit scores are a valid way to price premiums.
But others argue that using credit information to price insurance doesn’t make sense.
Because a homeowner pays for insurance upfront, “it’s not like you’re really extending a loan to the customer where you would be worried about the risk of repayment,” Ms. Kousky said. She points out that insurance companies can opt not to renew a homeowner’s policy if they believe it is too risky — a tactic they have been using with increasing frequency.
The NBER analysis found that homeowners who want to pay less for insurance should pay off debt to raise their credit score rather than replace roofs and make other improvements to avoid damage when disaster strikes.
Others believe that even if credit scores are accurate predictors of future claims, they shouldn’t be used to set premiums because that can perpetuate or worsen disparities. For example, people in their mid-20s who are Black, low-income, or grow up in impoverished regions have significantly lower credit scores than their peers, a July working paper from Opportunity Insights, a not-for-profit organization at Harvard University, found.
“When the government and the financial system mandate that we buy a product, there’s a special obligation to make sure the pricing is fair,” said Doug Heller, director of insurance at the Consumer Federation. “To me that is an absolutely solid reason, just like we don’t allow pricing based on race or income or ethnicity or religion.”
A natural experiment
A handful of states, including California and Massachusetts, have banned or limited the use of credit scores in setting home insurance premiums, despite opposition from the insurance industry.
In Nevada, where a temporary pandemic-related rule prevented insurers from using credit history to increase premiums for existing customers from 2020 to 2024, companies refunded approximately $27 million to nearly 200,000 policyholders, said Drew Pearson, a spokesman for the Nevada Division of Insurance.
Perhaps the clearest example of the effects of these bans comes from Washington State, which banned the use of credit information in setting home insurance premiums starting in June 2021. The rule immediately faced legal challenges, and was in effect for just a few months until it was overturned in court.
But the episode allowed researchers to evaluate the effect of credit factors on insurance premiums. When the rule took effect, people with the lowest credit scores saw a decrease in premiums of about $175 annually while those with the highest scores saw an increase of about $100, the NBER analysis found.
“We could see the dynamics of insurance pricing for the same households over time,” said Benjamin Keys, a professor at the University of Pennsylvania’s Wharton School, who co-authored the paper.
What homeowners paid before and after a ban on credit-based pricing in Washington State
Values compared with premiums paid by homeowners with “medium” credit scores (717 to 756)
In Minnesota, where Tara Novak, Petra Rodriguez and Audrey Thayer live, a state task force looked at ways to lower insurance costs for residents. It recently considered a ban or limit on the use of credit scores to set rates, but did not move forward with a recommendation.
Ms. Rodriguez said she doesn’t think it’s fair that her friend Ms. Novak should have to pay so much more for insurance to live in an identical house.
A credit score doesn’t capture anything about a person’s habits, or what they’re like as a tenant, or even years of on-time rent payments, she said. “It’s not who you are,” she said.
Methodology
Home insurance policy rates were supplied by Quadrant Information Services, an insurance data solutions company. The rates shown are representative of publicly sourced filings and should not be interpreted as bindable quotes. Actual individual premiums may vary.
‘States with the biggest pricing gaps’Rates shown are based on a home insurance policy with $400,000 of dwelling coverage and a $100,000 liability limit on a new home, for a homeowner age 50 or younger. Rates are averaged for all the individual company filings represented in the sample, which add up to a majority of the market share in each state but do not cover all active insurers in the state. Rates are also averaged to the state level from zip code level data.
‘The credit penalty in each state’Each insurance company incorporates credit history information differently, often using proprietary methods, so the scores do not map directly to FICO credit scores.
‘What homeowners paid before and after a ban on credit-based pricing in Washington State’Data shown are based on observations of real home insurance policies and homeowner credit scores from ICE McDash analyzed by the researchers of Blonz, Hossain, Keys, Mulder and Weill (2026). The price comparisons across credit score tiers controlled for variance in disaster risk, insurance policy characteristics, geography, and other year to year fluctuations.
Science
Earth is warming faster than previously estimated, new study shows
Planetary warming has significantly accelerated over the past 10 years, with temperatures rising at a higher rate since 2015 than in any previous decade on record, a new study showed.
The Earth warmed around 0.35 degrees Celsius in the decade to 2025, compared to just under 0.2C per decade on average between 1970 and 2015, according to a paper published on Friday in the scientific journal Geophysical Research Letters. This is the first statistically significant evidence of an acceleration of global warming, the authors said.
The past three years have been the hottest on record, compared to the average before the Industrial Revolution. In 2024, warming went past 1.5C, the lower limit set by the Paris Agreement. That target refers to temperature increases over 20 years, but breaching it for one year shows efforts to slow down climate change have been insufficient, the scientists who wrote the new paper said.
The findings shed light on an ongoing debate among researchers. While there is consensus that greenhouse gas emissions have caused the planet to heat up since pre-industrial times, that warming had been steady for decades. But record-breaking temperatures in recent years have led scientists to question whether the pace of temperature gains is accelerating.
Demonstrating that was difficult due to natural fluctuations in temperatures. The researchers filtered out the “noise” to make the “underlying long-term warming signal” more clearly visible, said Grant Foster, a co-author of the study and a U.S.-based statistics expert.
Researchers isolated phenomena including the El Niño weather phase, volcanic eruptions and solar irradiance. When looking at temperature increases without their influence, the authors concluded the evidence is “strong” that the accelerated warming was not due to an unusually hot 2023 and 2024, but that since 2015 global temperatures departed from their previous, slower path of warming.
The new report adds to a growing body of work that indicates climate change is having a quicker and larger impact on the planet than scientists have understood. A separate paper published this week found that many studies on sea-level increases underestimate how much water along the coast has already risen.
“If the warming rate of the past 10 years continues, it would lead to a long-term exceedance of the 1.5C limit of the Paris Agreement before 2030,” said Stefan Rahmstorf, the lead author of the warming study and a researcher at the Potsdam Institute for Climate Impact Research. “How quickly the Earth continues to warm ultimately depends on how rapidly we reduce global CO2 emissions from fossil fuels to zero.”
Millan writes for Bloomberg.
Science
The neuro disease rat lungworm has reached California
A disease that can cause neurological illness and meningitis in people, rat lungworm, has been found in wild opposums, rats and a zoo animal in San Diego County, indicating its establishment in California for the first time.
Researchers reported their findings in the journal Emerging Infectious Diseases, published by the U.S. Centers for Disease Control and Prevention. The authors, who include veterinarians, researchers and wildlife biologists, urged physicians and other healthcare workers in the region to consider lungworm infection when patients come in with nervous system disorders.
The discovery highlights “a notable expansion of the range of this parasite in North America,” they said.
The CDC website says the risk to the general public of getting this infection is low, but it can be deadly.
If ingested, the worms can cause severe headaches, stiff neck, the sensation of tingling or painful skin, low-grade fever, nausea, vomiting, coma and sometimes death. People who eat freshwater crab, prawns, frogs, snails and slugs are at greatest risk. However, people can also get the disease by eating un-rinsed produce that’s been slimed by a snail or slug, or eating a slug or snail that was chopped up in produce. The worms need moisture, however; if the produce is dry, the worms will die.
Domestic animals, including dogs and cats, are also at risk.
Officials with the California Department of Public Health were not ready to call the disease endemic, or established, in the state.
“Additional surveillance and testing will be necessary to determine whether the detections of rat lungworm in the animals evaluated in San Diego County represent an isolated introduction of the parasite or ongoing local transmission,” spokeswoman Elizabeth Manzo wrote in a statement to The Times.
The department said it is not aware of rat lungworm outside San Diego County, and has seen no human cases.
“However, the San Diego study affirms that the parasite can be introduced to California through movement of infected animals from endemic areas,” the statement said. “Because some species of snails and slugs present in California are capable of serving as hosts for rat lungworm, and the presence of the parasite in other parts of the state is unknown, it is advised to take certain food safety precautions. Persons should not consume any raw or undercooked wild snails or slugs, and should thoroughly wash all produce before consuming.”
The worms that cause the disease, Angiostrongylus cantonensis, are native to Southeast Asia. They’ve been found in the U.S. since the 1960s — including in isolated human and zoo animal cases in California — and are established in Hawaii as well as in much of the southeastern U.S.
It is believed they came overseas via rats on boats.
The worms favored environment is the moist, warm bed of a rat’s lung. When a rat is infected, the worms cause respiratory distress, priming the rodent to cough. Worm-filled sputum is then ejected into the rat’s mouth, and swallowed. The rat then poops the worms out, and animals such as slugs and snails eat the poop. When a rat eats an infected invertebrate, the cycle begins again.
Occasionally, another animal, such as a raccoon or dog, or a person, will accidentally eat an infected animal, or the slime of one, and contract the disease.
The discovery of the worm in San Diego County rodents and opossums was made by staff at the San Diego Zoo and a local wildlife rehabilitation center, Project Wildlife, which is run by the San Diego Humane Society.
In December 2024, a 7-year-old male parma wallaby, born and raised at the zoo, began showing concerning neurological behaviors: incessant head shaking, blindness, a lack of muscle coordination and paralysis in his hind legs. He was euthanized after 11 days in the zoo infirmary.
When zoo staff examined the body, they found six rat lungworms in the marsupial’s brain, along with a lot of damage.
Because the diagnosis was so unusual, zoo staff examined the bodies of 64 free-ranging roof rats that had either been euthanized in the course of regular pest control or found dead on the property. Two, a little more than 3%, had lungworms. Their feces had them too: “numerous live … larvae with coiled posterior ends.” The larvae, roughly 300 in each poop sample, were each about the size of a grain of sand.
Officials at the San Diego Zoo did not respond to requests for comment.
Curiously, at the same time the zoo investigation was underway, staff from Project Wildlife had been dealing with sick opossums brought to them from around the county. Tests of 10 dead animals showed seven carried the lungworms.
Many people and animals remain asymptomatic when they’re infected. Symptoms typically appear within hours or days after ingestion and can last up to eight weeks. The worms will eventually die.
Because the disease has so many varied symptoms, health officials say it can go undiagnosed and untreated. Health officials from Hawaii, where the disease is endemic, say if lungworms are suspected, it’s best to be treated as soon as possible — even before lab results come back.
The CDC too notes that treatment works best when the disease is caught early, and can consist of high doses of corticosteroids, lumbar punctures for symptomatic relief of headaches, and antiparasitic medications, such as albendazole.
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