Science
Behind his smile, a silent crisis: Parents seek answers after autistic son’s suicide
When Anthony Tricarico was diagnosed at 7 with autism spectrum disorder, his parents, Neal and Samara, were told that he might need extra support at school, so they made sure he got it. When doctors suggested therapies for his speech and motor skills, they sought those out too.
But when their kind, popular, accomplished boy began to experience depression and suicidal ideation as a teenager, no one told them that the same thinking patterns that powered many of Anthony’s achievements might also be amplifying his most harmful thoughts, or that the effort of masking his autism could be hurting his mental health.
None of the people or organizations they contacted for help said Anthony might benefit from therapies or safety plans adapted for autistic people, or even that such things existed. They did not say that he might not show the same warning signs as a non-autistic teenager.
Neal Tricarico holds one of many rocks in honor of his son Anthony that friends and relatives have left in a memorial garden.
And only after he died from suicide in May 2024 did the San Diego County couple discover that autistic kids — particularly those like Anthony, whose disability is not immediately apparent from the outside — are more likely to think about and die from suicide, and at earlier ages, than their neurotypical peers.
“Our son has always been different. So why wouldn’t how we approach suicide be different?” Neal said.
Suicide is a leading cause of death in the U.S. for kids aged 10 to 18. Prevention strategies that take neurodiversity into account could go a long way toward reducing the number of young lives lost too soon.
Autism researchers and advocates are working to develop better screening tools and interventions based on the unique strengths and differences of an autistic brain. A crucial first step is educating the people best positioned to help kids when they’re in crisis, like parents, counselors, pediatricians and social workers.
“We’re aware of the need for tailored approaches. We’re doing this research. We’re trying to get the word out.”
— Danielle Roubinov, University of North Carolina at Chapel Hill
“These are kids that are experiencing all sorts of heightened risk,” said Danielle Roubinov, an associate professor and director of the Child and Adolescent Anxiety and Mood Disorders Program at University of North Carolina at Chapel Hill. “We’re aware of the need for tailored approaches. We’re doing this research. We’re trying to get the word out. And [suicidality] is something that is treatable. This is something that responds to intervention.”
The percentage of U.S. children with an autism diagnosis has risen steadily in recent decades, from 1 in 150 8-year-olds in 2000 to 1 in 31 in 2022.
The diagnostic definition has changed dramatically in that time, inscribing children with a broad range of abilities, needs and behaviors within a single term: autism spectrum disorder.
Today, the diagnosis includes children whose autism was previously overlooked because of their propensity for “masking,” the act of consciously or unconsciously suppressing autistic traits in order to blend in.
Samara and Neal Tricarico with a portrait of Anthony at their home.
For autistic children without intellectual disabilities, like Anthony Tricarico, masking often enables them to participate in mainstream classes or activities. It’s also why many children, especially girls, aren’t diagnosed with autism until later in childhood.
Masking can exact a powerful psychological toll on autistic kids, and is strongly correlated with depression, anxiety and suicide.
Anthony Tricarico was bright, athletic and autistic. His parents, Neal and Samara Tricarico, share what they wish they’d known when their son first started to struggle with his mental health.
Children across the autism spectrum are far more likely to struggle with mental health conditions than their allistic, or non-autistic, peers. A 2021 study of more than 42,000 caregivers of children ages 3 to 17 found that 78% of autistic children had at least one co-occurring psychiatric condition, compared with 14% of non-autistic kids. Contributing factors include the stress of living in a world that’s sensorially overwhelming or socially impenetrable. Lights, noises, smells and crowds that others barely notice may cause incapacitating anxiety.
For kids who cope by masking, constantly deciphering and mimicking social responses is often cognitively and emotionally exhausting. “Masking is actually a risk factor of suicide for autistic people,” said Lisa Morgan, founder of the Autism and Suicide Prevention Workgroup, who is autistic herself.
One of many rocks in honor of Anthony that have been left in the family’s memorial garden.
Autistic people at all ages are more likely to die by suicide than those who aren’t autistic. That disparity begins early. One 2024 meta-analysis found that some 10% of autistic children and teens had attempted suicide, a rate more than twice that of non-autistic peers.
Their struggles are often invisible.
Neal and Samara had never heard of masking.
They saw how Anthony thrived on schedules and sameness. He rose precisely at 5 a.m. for a long workout, chugged the same protein shake afterward, took a shower at 7 a.m. on the dot. At the time they thought he was extremely disciplined; they believe now it was also Anthony’s way of fulfilling his need for routine and predictability, a common autistic trait.
They also saw that he preferred to keep his diagnosis a secret.
Anthony’s black belt in karate rests on a table in the family home.
In middle school, Anthony announced that he no longer wanted any accommodations for his autism: no more individualized education program, no more behavioral therapy, no more telling new friends or teachers about his diagnosis.
“It’s my belief he just wanted all that to go away, and to just be like everyone else,” Neal said.
The pandemic hit Anthony hard. He couldn’t work out at his favorite spots or fish, a beloved pastime. Other kids might have defied the closures and gone anyway, but Anthony followed rules with inflexible intensity, Neal said, especially the ones he set for himself.
His mental health started to decline. In 2022, during his freshman year, Neal and Samara learned that Anthony told a friend he was having thoughts of suicide.
They called the California suicide hotline, where a volunteer told them to contact his school. A counselor determined that since Anthony didn’t have a plan, he wasn’t at immediate risk.
When Neal and Samara asked him about it, he sounded almost dismissive. It was fleeting, he said. It wasn’t real.
Neal looks over a living room table covered in photographs and medals Anthony won in 5Ks, half marathons and other athletic competitions.
It’s impossible to know Anthony’s true thoughts. What is known is that suicidal ideation can look very different in autistic kids.
About a decade ago, psychiatrist Dr. Mayank Gupta started noticing an uptick in a particular type of patient at the western Pennsylvania inpatient facilities in which he worked: bright children from stable home environments who began having serious suicidal thoughts in early adolescence.
They showed few of the typical youth-suicide risk factors, like substance use or histories of neglect. A surprising number had autism diagnoses.
At the time, Gupta associated autism with behaviors like minimal verbal communication and noticeable differences in body language or eye contact. Nothing in his training or continuing education discussed the breadth of the autism spectrum, or how it might relate to children’s mental health.
He searched the literature, and was stunned to find how much published work there was on autism and suicide.
“In the last seven to eight years, there’s been more and more evidence, and more and more research,” he said. But not enough of it has made its way to the local psychologists, psychiatrists and pediatricians that parents are most likely to turn to for help with a struggling child.
Adults often assume that a child who can speak fluently on a variety of subjects can explain their thoughts and feelings with a similar level of insight. But up to 80% of autistic kids have alexithymia, or difficulty identifying and describing one’s own internal emotional state. For this reason, “it makes sense that all of the interventions that have been designed for a neurotypical youth probably aren’t going to translate in the same way to autistic youth,” said Jessica Schwartzman, director of the Training and Research to Empower NeuroDiversity Lab at Children’s Hospital Los Angeles and assistant professor of pediatrics at USC’s Keck School of Medicine.
Autistic people are often stereotyped as unable to read other people, Morgan said, but neurotypical people often have just as hard a time accurately interpreting an autistic person’s emotional state.
“What people are looking for is that really outward display of emotions and tears and angst,” said Morgan, of the Autism and Suicide Prevention Workgroup. “But for autistic people, that all can be happening on the inside without the autistic person being able to communicate that. And in fact, the further in crisis they go, the less they’re able to verbally communicate.”
As high school progressed, Anthony gave “the appearance of thriving,” Neal said: a 4.6 grade-point average, two part-time jobs, a busy social life. He ran marathons and finished grueling Spartan Races.
“But for us, living with him every day, we saw the black-and-white thinking really, really intensify,” Neal said. “The intensity and speed with which he was coming up with new things to achieve became more and more, and the feeling of lack of fulfillment became even greater.”
“Living with him every day, we saw the black-and-white thinking really, really intensify.”
— Neal Tricarico, Anthony’s father
In 2023, Anthony told his mother that the suicidal thoughts were back. He wanted to go to an inpatient facility that could keep him safe.
They dialed every number they could find. They called a county mobile crisis response team, which determined that since Anthony had no clear plan, he likely wasn’t at risk. They called a therapist he’d seen when he was younger. But Anthony was clear: He wasn’t OK and needed to be somewhere that could help.
When they finally found a facility able to admit him, they checked him in with a sense of relief. Immediately, they all felt they’d made a mistake.
Some of the medals Anthony won in marathons, Spartan Races and other competitions.
The only available bed was in solitary confinement. He couldn’t exercise, go outside or follow his routines.
Emergency rooms or inpatient facilities are sometimes the only option to keep someone safe during a suicidal crisis. But separated from familiar settings, objects and routines, and inundated with stimuli like bright lights, many autistic kids find them more disturbing than therapeutic, researchers said.
“The people that work in those facilities are obviously incredible, but they may or may not have special training in strategies and communication practices and approaches that are tailored to meet the needs of autistic individuals,” Roubinov said.
Anthony called his parents begging to come home. After two nights, the Tricaricos signed him out. On the way home Samara asked him to promise he’d tell them if he ever had suicidal thoughts again.
“He said, ‘No. I will never,’” she recalled.
His parents interpreted his words to mean he’d never think that way again, and that the worst was over. They now believe he was really saying that he had lost hope.
Another year passed. In March 2024, Anthony and his sister met up with friends who later said he seemed happier than he’d been in a while. He gave one an envelope of cash he’d saved and told her to take herself to Disneyland.
He was surrounded by people who cared about him, all unaware that he was displaying classic warning signs of an imminent crisis: giving away valuables, a sudden lift in spirits, indirectly saying goodbye.
The next day he was quiet and downcast.
“I could tell he had been crying, and I said, ’What’s going on? Is it friends? Is it work? Is it school work?’” Samara recalled. “And he said, ‘It’s all of it.’”
That afternoon, after finishing his chores, Anthony told his parents he was going for some fresh air, which he often did to clear his head. They could see on their phones that he was taking a familiar route through their Cardiff-by-the-Sea neighborhood.
His icon paused. Maybe he got a phone call, his parents thought, or bumped into friends.
Dusk fell. Samara’s phone rang with a call from Anthony’s number. It was a sheriff’s deputy. They’d found him.
Anthony spent nine weeks in the hospital. He died on May 25, 2024. He was 16 years old.
Colorful, painted rocks in honor of Anthony decorate a memorial garden.
Months later, Neal got a message from a Facebook friend who worked at a suicide-prevention foundation, asking if he knew about the particular risks facing autistic kids.
It was the first time he’d heard of anything of the sort.
They scheduled a Zoom call and she walked him through all of it: The stats, the research, the reasons that warning signs for kids like Anthony can look so different that the most attentive parents can miss them.
There is no simple explanation for why any one individual dies by suicide. As seriously as Neal and Samara took their son’s mental health struggles, it was impossible to imagine him ending his life. It didn’t fit with his zeal for living or his disdain for shortcuts. In retrospect, they say, it was also too frightening to contemplate.
“You drive yourself crazy saying, ‘what if.’”
— Samara Tricarico, Anthony’s mother
But had they known how common such thoughts and actions are for young people in Anthony’s sector of the autism spectrum, they said, they would have approached it differently.
“You drive yourself crazy saying, ‘what if,’ Samara said. “But I would have liked to have known that, because it potentially could have saved his life.”
About 20% of U.S. high schoolers disclosed suicidal thoughts in 2023, according to the Centers for Disease Control and Prevention. When the Kennedy Krieger Institute in Baltimore asked caregivers of 900 autistic children if the children had thought about ending their lives, 35% said yes. Nearly 1 in 5 had made a plan. The youngest respondent was 8 years old.
The risk may be particularly high for gifted kids trying to function in a world designed for a different way of thinking. In one 2023 study from the University of Iowa, autistic kids with an IQ of 120 or higher were nearly six times more likely to have suicidal thoughts than autistic children with average IQ. For non-autistic children, the opposite was true: Higher cognitive ability was associated with a decreased risk of suicide.
There’s no clear protocol for families like the Tricaricos. There are therapists and psychiatrists specially trained in autism, but not enough to meet demand.
Researchers are, however, looking for ways to tailor existing therapies to better serve autistic kids, and to educate healthcare providers on the need to use them.
One starting point is the Columbia-Suicide Severity Rating Scale, the standard that healthcare professionals currently use to identify at-risk children in the general population. Schwartzman’s lab found that when the questionnaire was administered verbally to autistic kids, it flagged only 80% of those in the study group who were having suicidal thoughts. A second, written questionnaire identified the other 20%. Schwartzman recommends that providers use a combined spoken and written screening approach at intake, since some autistic people find text questions easier to process than verbal ones.
Another candidate for adaptation is the Stanley-Brown safety plan, a reference document where patients list coping strategies, helpful distractions and trusted contacts on a one-page sheet that can be easily accessed in a crisis. Research has found that people with a completed plan are less likely to act on suicidal thoughts and more likely to stick with follow-up care. It’s cheap and accessible — free templates in multiple languages can be easily found online.
But like most mental health treatments, it was developed with the assumption that the person using it is neurotypical. There isn’t much research on whether the Stanley-Brown is less effective for autistic people, but researchers and advocates say it stands to reason that some tailored adjustments to the standard template could be helpful.
Shari Jager-Hyman, a clinical psychologist and assistant professor at the University of Pennsylvania’s Perelman School of Medicine, and Lisa Morgan of the Autism and Suicide Prevention Workgroup are creating an autism-friendly version.
Some changes are as simple as removing numbered lines and leaving blank space under headings like “Sources of support.” Many autistic people think literally and may perceive three numbered lines as an order to provide exactly three items, Morgan said, which can be especially disheartening if there aren’t three people in their circle of trust.
Jager-Hyman and Roubinov, of UNC, are currently leading a study looking at outcomes for suicidal autistic children who use the modified Stanley-Brown plan.
The way adults interact with autistic children in crisis may also make a difference. Sensory overload can be extremely destabilizing, so an autistic child may first need a quiet place with dim lighting to calm themselves, and extra time to process and form answers to providers’ questions.
For parents and other caregivers, the best thing they can offer might be a quiet, supportive presence, Morgan said: “For an autistic person, it could be they want somebody there with them, but they just want to sit in silence.”
The knowledge Neal and Samara have acquired since losing Anthony has felt to them like a missing piece that makes sense of his story, and a light illuminating their path ahead.
Earlier this year, they founded the Endurant Movement, a nonprofit dedicated to autism, youth suicide and mental health. They have joined advocates who say the most effective way to reduce rates of depression, anxiety and the burden of masking is to ensure that autistic kids have the support they need, and don’t feel like they have to change everything about themselves in order to fit in.
“Suicide prevention for autistic people is being accepted for who they are, being able to be who they are without masking,” Morgan said.
The Tricaricos imagine interventions that could make a difference: practical, evidence-based guidelines that families and clinicians can follow when an autistic child is in crisis; information shared at the time of diagnosis about the possibility of co-occurring mental health conditions; support for autistic kids that frames their differences as unique features, not deficits to be overcome.
And above all, a willingness to have the hardest conversations before it is too late.
“Suicide prevention for autistic people is being accepted for who they are, being able to be who they are without masking.”
— Lisa Morgan, Autism and Suicide Prevention Workgroup
There is a common misconception that asking about suicide could plant the idea in a child’s head and lead to further harm. If anything, researchers said, it’s protective. Ask in whatever way a child is comfortable with: a text, a written letter, in conversation with a trusted therapist.
“Suicide is so stigmatized and people are so afraid to talk about it,” Samara said. “If we can talk about it, invite the conversation, we can normalize it so they can feel less alone.”
She and Neal were seated next to each other on a bench in their front garden, surrounded by rocks friends and family had painted with tributes to Anthony.
“We didn’t know that our son was going to take his life this way. If we knew that having the conversation could help, we would have,” she said, as Neal nodded.
“And so that’s the message. Have the conversation, as difficult as it feels, as scary as it is … . Have the courage to step into that, knowing that that could possibly save someone’s life. Your child’s life.”
If you or someone you know is struggling with suicidal thoughts, seek help from a professional or call 988. The nationwide three-digit mental health crisis hotline will connect callers with trained mental health counselors. Or text “HOME” to 741741 in the U.S. and Canada to reach the Crisis Text Line.
This article was reported with the support of the USC Annenberg Center for Health Journalism’s National Fellowship’s Kristy Hammam Fund for Health Journalism.
Science
Commentary: My toothache led to a painful discovery: The dental care system is full of cavities as you age
I had a nagging toothache recently, and it led to an even more painful revelation.
If you X-rayed the state of oral health care in the United States, particularly for people 65 and older, the picture would be full of cavities.
“It’s probably worse than you can even imagine,” said Elizabeth Mertz, a UC San Francisco professor and Healthforce Center researcher who studies barriers to dental care for seniors.
Mertz once referred to the snaggletoothed, gap-filled oral health care system — which isn’t really a system at all — as “a mess.”
But let me get back to my toothache, while I reach for some painkiller. It had been bothering me for a couple of weeks, so I went to see my dentist, hoping for the best and preparing for the worst, having had two extractions in less than two years.
Let’s make it a trifecta.
My dentist said a molar needed to be yanked because of a cellular breakdown called resorption, and a periodontist in his office recommended a bone graft and probably an implant. The whole process would take several months and cost roughly the price of a swell vacation.
I’m lucky to have a great dentist and dental coverage through my employer, but as anyone with a private plan knows, dental insurance can barely be called insurance. It’s fine for cleanings and basic preventive routines. But for more complicated and expensive procedures — which multiply as you age — you can be on the hook for half the cost, if you’re covered at all, with annual payout caps in the $1,500 range.
“The No. 1 reason for delayed dental care,” said Mertz, “is out-of-pocket costs.”
So I wondered if cost-wise, it would be better to dump my medical and dental coverage and switch to a Medicare plan that costs extra — Medicare Advantage — but includes dental care options. Almost in unison, my two dentists advised against that because Medicare supplemental plans can be so limited.
Sorting it all out can be confusing and time-consuming, and nobody warns you in advance that aging itself is a job, the benefits are lousy, and the specialty care you’ll need most — dental, vision, hearing and long-term care — are not covered in the basic package. It’s as if Medicare was designed by pranksters, and we’re paying the price now as the percentage of the 65-and-up population explodes.
So what are people supposed to do as they get older and their teeth get looser?
A retired friend told me that she and her husband don’t have dental insurance because it costs too much and covers too little, and it turns out they’re not alone. By some estimates, half of U.S. residents 65 and older have no dental insurance.
That’s actually not a bad option, said Mertz, given the cost of insurance premiums and co-pays, along with the caps. And even if you’ve got insurance, a lot of dentists don’t accept it because the reimbursements have stagnated as their costs have spiked.
But without insurance, a lot of people simply don’t go to the dentist until they have to, and that can be dangerous.
“Dental problems are very clearly associated with diabetes,” as well as heart problems and other health issues, said Paul Glassman, associate dean of the California Northstate University dentistry school.
There is one other option, and Mertz referred to it as dental tourism, saying that Mexico and Costa Rica are popular destinations for U.S. residents.
“You can get a week’s vacation and dental work and still come out ahead of what you’d be paying in the U.S.,” she said.
Tijuana dentist Dr. Oscar Ceballos told me that roughly 80% of his patients are from north of the border, and come from as far away as Florida, Wisconsin and Alaska. He has patients in their 80s and 90s who have been returning for years because in the U.S. their insurance was expensive, the coverage was limited and out-of-pocket expenses were unaffordable.
“For example, a dental implant in California is around $3,000-$5,000,” Ceballos said. At his office, depending on the specifics, the same service “is like $1,500 to $2,500.” The cost is lower because personnel, office rent and other overhead costs are cheaper than in the U.S., Ceballos said.
As we spoke by phone, Ceballos peeked into his waiting room and said three patients were from the U.S. He handed his cellphone to one of them, San Diegan John Lane, who said he’s been going south of the border for nine years.
“The primary reason is the quality of the care,” said Lane, who told me he refers to himself as 39, “with almost 40 years of additional” time on the clock.
Ceballos is “conscientious and he has facilities that are as clean and sterile and as medically up to date as anything you’d find in the U.S.,” said Lane, who had driven his wife down from San Diego for a new crown.
“The cost is 50% less than what it would be in the U.S.,” said Lane, and sometimes the savings is even greater than that.
Come this summer, Lane may be seeing even more Californians in Ceballos’ waiting room.
“Proposed funding cuts to the Medi-Cal Dental program would have devastating impacts on our state’s most vulnerable residents,” said dentist Robert Hanlon, president of the California Dental Assn.
Dental student Somkene Okwuego smiles after completing her work on patient Jimmy Stewart, 83, who receives affordable dental work at the Ostrow School of Dentistry of USC on the USC campus in Los Angeles on February 26, 2026.
(Genaro Molina / Los Angeles Times)
Under Proposition 56’s tobacco tax in 2016, supplemental reimbursements to dentists have been in place, but those increases could be wiped out under a budget-cutting proposal. Only about 40% of the state’s dentists accept Medi-Cal payments as it is, and Hanlon told me a CDA survey indicates that half would stop accepting Medi-Cal patients and many others will accept fewer patients.
“It’s appalling that when the cost of providing healthcare is at an all-time high, the state is considering cutting program funding back to 1990s levels,” Hanlon said. “These cuts … will force patients to forgo or delay basic dental care, driving completely preventable emergencies into already overcrowded emergency departments.”
Somkene Okwuego, who as a child in South L.A. was occasionally a patient at USC’s Herman Ostrow School of Dentistry clinic, will graduate from the school in just a few months.
I first wrote about Okwuego three years ago, after she got an undergrad degree in gerontology, and she told me a few days ago that many of her dental patients are elderly and have Medi-Cal or no insurance at all. She has also worked at a Skid Row dental clinic, and plans after graduation to work at a clinic where dental care is free or discounted.
Okwuego said “fixing the smiles” of her patients is a privilege and boosts their self-image, which can help “when they’re trying to get jobs.” When I dropped by to see her Thursday, she was with 83-year-old patient Jimmy Stewart.
Stewart, an Army veteran, told me he had trouble getting dental care at the VA and had gone years without seeing a dentist before a friend recommended the Ostrow clinic. He said he’s had extractions and top-quality restorative care at USC, with the work covered by his Medi-Cal insurance.
I told Stewart there could be some Medi-Cal cuts in the works this summer.
“I’d be screwed,” he said.
Him and a lot of other people.
steve.lopez@latimes.com
Science
Diablo Canyon clears last California permit hurdle to keep running
Central Coast Water authorities approved waste discharge permits for Diablo Canyon nuclear plant Thursday, making it nearly certain it will remain running through 2030, and potentially through 2045.
The Pacific Gas & Electric-owned plant was originally supposed to shut down in 2025, but lawmakers extended that deadline by five years in 2022, fearing power shortages if a plant that provides about 9 percent the state’s electricity were to shut off.
In December, Diablo Canyon received a key permit from the California Coastal Commission through an agreement that involved PG&E giving up about 12,000 acres of nearby land for conservation in exchange for the loss of marine life caused by the plant’s operations.
Today’s 6-0 vote by the Central Coast Regional Water Board approved PG&E’s plans to limit discharges of pollutants into the water and continue to run its “once-through cooling system.” The cooling technology flushes ocean water through the plant to absorb heat and discharges it, killing what the Coastal Commission estimated to be two billion fish each year.
The board also granted the plant a certification under the Clean Water Act, the last state regulatory hurdle the facility needed to clear before the federal Nuclear Regulatory Commission (NRC) is allowed to renew its permit through 2045.
The new regional water board permit made several changes since the last one was issued in 1990. One was a first-time limit on the chemical tributyltin-10, a toxic, internationally-banned compound added to paint to prevent organisms from growing on ship hulls.
Additional changes stemmed from a 2025 Supreme Court ruling that said if pollutant permits like this one impose specific water quality requirements, they must also specify how to meet them.
The plant’s biggest water quality impact is the heated water it discharges into the ocean, and that part of the permit remains unchanged. Radioactive waste from the plant is regulated not by the state but by the NRC.
California state law only allows the plant to remain open to 2030, but some lawmakers and regulators have already expressed interest in another extension given growing electricity demand and the plant’s role in providing carbon-free power to the grid.
Some board members raised concerns about granting a certification that would allow the NRC to reauthorize the plant’s permits through 2045.
“There’s every reason to think the California entities responsible for making the decision about continuing operation, namely the California [Independent System Operator] and the Energy Commission, all of them are sort of leaning toward continuing to operate this facility,” said boardmember Dominic Roques. “I’d like us to be consistent with state law at least, and imply that we are consistent with ending operation at five years.”
Other board members noted that regulators could revisit the permits in five years or sooner if state and federal laws changes, and the board ultimately approved the permit.
Science
Deadly bird flu found in California elephant seals for the first time
The H5N1 bird flu virus that devastated South American elephant seal populations has been confirmed in seals at California’s Año Nuevo State Park, researchers from UC Davis and UC Santa Cruz announced Wednesday.
The virus has ravaged wild, commercial and domestic animals across the globe and was found last week in seven weaned pups. The confirmation came from the U.S. Department of Agriculture’s National Veterinary Services Laboratory in Ames, Iowa.
“This is exceptionally rapid detection of an outbreak in free-ranging marine mammals,” said Professor Christine Johnson, director of the Institute for Pandemic Insights at UC Davis’ Weill School of Veterinary Medicine. “We have most likely identified the very first cases here because of coordinated teams that have been on high alert with active surveillance for this disease for some time.”
Since last week, when researchers began noticing neurological and respoiratory signs of the disease in some animals, 30 seals have died, said Roxanne Beltran, a professor of ecology and evolutionary biology at UC Santa Cruz. Twenty-nine were weaned pups and the other was an adult male. The team has so far confirmed the virus in only seven of the dead pups.
Infected animals often have tremors convulsions, seizures and muscle weakness, Johnson said.
Beltran said teams from UC Santa Cruz, UC Davis and California State Parks monitor the animals 260 days of the year, “including every day from December 15 to March 1” when the animals typically come ashore to breed, give birth and nurse.
The concerning behavior and deaths were first noticed Feb. 19.
“This is one of the most well-studied elephant seal colonies on the planet,” she said. “We know the seals so well that it’s very obvious to us when something is abnormal. And so my team was out that morning and we observed abnormal behaviors in seals and increased mortality that we had not seen the day before in those exact same locations. So we were very confident that we caught the beginning of this outbreak.”
In late 2022, the virus decimated southern elephant seal populations in South America and several sub-Antarctic Islands. At some colonies in Argentina, 97% of pups died, while on South Georgia Island, researchers reported a 47% decline in breeding females between 2022 and 2024. Researchers believe tens of thousands of animals died.
More than 30,000 sea lions in Peru and Chile died between 2022 and 2024. In Argentina, roughly 1,300 sea lions and fur seals perished.
At the time, researchers were not sure why northern Pacific populations were not infected, but suspected previous or milder strains of the virus conferred some immunity.
The virus is better known in the U.S. for sweeping through the nation’s dairy herds, where it infected dozens of dairy workers, millions of cows and thousands of wild, feral and domestic mammals. It’s also been found in wild birds and killed millions of commercial chickens, geese and ducks.
Two Americans have died from the virus since 2024, and 71 have been infected. The vast majority were dairy or commercial poultry workers. One death was that of a Louisiana man who had underlying conditions and was believed to have been exposed via backyard poultry or wild birds.
Scientists at UC Santa Cruz and UC Davis increased their surveillance of the elephant seals in Año Nuevo in recent years. The catastrophic effect of the disease prompted worry that it would spread to California elephant seals, said Beltran, whose lab leads UC Santa Cruz’s northern elephant seal research program at Año Nuevo.
Johnson, the UC Davis researcher, said the team has been working with stranding networks across the Pacific region for several years — sampling the tissue of birds, elephant seals and other marine mammals. They have not seen the virus in other California marine mammals. Two previous outbreaks of bird flu in U.S. marine mammals occurred in Maine in 2022 and Washington in 2023, affecting gray and harbor seals.
The virus in the animals has not yet been fully sequenced, so it’s unclear how the animals were exposed.
“We think the transmission is actually from dead and dying sea birds” living among the sea lions, Johnson said. “But we’ll certainly be investigating if there’s any mammal-to-mammal transmission.”
Genetic sequencing from southern elephant seal populations in Argentina suggested that version of the virus had acquired mutations that allowed it to pass between mammals.
The H5N1 virus was first detected in geese in China in 1996. Since then it has spread across the globe, reaching North America in 2021. The only continent where it has not been detected is Oceania.
Año Nuevo State Park, just north of Santa Cruz, is home to a colony of some 5,000 elephant seals during the winter breeding season. About 1,350 seals were on the beach when the outbreak began. Other large California colonies are located at Piedras Blancas and Point Reyes National Sea Shore. Most of those animals — roughly 900 — are weaned pups.
It’s “important to keep this in context. So far, avian influenza has affected only a small proportion of the weaned at this time, and there are still thousands of apparently healthy animals in the population,” Beltran said in a press conference.
Public access to the park has been closed and guided elephant seal tours canceled.
Health and wildlife officials urge beachgoers to keep a safe distance from wildlife and keep dogs leashed because the virus is contagious.
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