An investigation by ProPublica has found that H5N1 avian influenza has been spreading on a fur farm in Utah since mid-August, with no cull, no formal quarantine and no ongoing monitoring of workers. Scientists warn that mink are an animal in which flu viruses can adapt to mammals. No human infection has been reported.
Of all the animals that H5N1 avian influenza has jumped into since 2020, few worry virologists more than mink. On 23 October, the US non-profit newsroom ProPublica reported that the virus has been circulating on a mink farm in Utah for more than two months, and that federal and state authorities have chosen, or found themselves unable, to stop it.
The farm is C&T Fenn Farms, a fur farm west of Provo, about an hour south of Salt Lake City, which raises thousands of mink. Utah agriculture officials learned in mid-August that mink were dying of bird flu. The US Department of Agriculture’s public dashboard lists seven captive mink in Utah as confirmed positive; ProPublica does not give a total number of deaths. Neither federal nor state officials had made a public statement before the dashboard was updated.
The same virus as in US cattle
Genomic data from the mink’s lungs and brains matched the strain of H5N1 that spread through American poultry from 2022 and into dairy cattle in 2024, according to the report. The farm’s owner, Chad Fenn, said the animals are routinely fed raw livestock organs, including cow parts; officials do not know whether contaminated meat was the source.
Early USDA sequences showed no particularly concerning mutations, experts and the US Centers for Disease Control and Prevention (CDC) told ProPublica. But the virus has had two further months to replicate, and newer samples, taken about two weeks before publication, had not been analysed.
Why mink matter
Influenza viruses infect cells by binding to receptors on their surface. Avian viruses prefer receptors common in birds; human-adapted viruses prefer those lining the human nose and throat. Mink airways carry many of both kinds. That makes them a potential “mixing vessel”: a host in which an avian virus can acquire mutations that improve its ability to infect mammals, or swap genes with a seasonal flu virus in a process called reassortment.
Several of the scientists ProPublica interviewed stressed that reassortment is the most likely route to a pandemic. Jennifer Nuzzo, director of the Pandemic Center at Brown University School of Public Health, made that point, and the report notes that the US flu season began unusually early this year. Tom Peacock, an avian influenza researcher at the Pirbright Institute in the UK, said other countries facing H5N1 on fur farms had culled quickly, and that Utah’s response was concerning.
The precedent is real. During the COVID-19 pandemic, SARS-CoV-2 spread through mink farms in Europe and the United States and passed back to farm workers, prompting mass culls; Utah itself responded aggressively in 2020, testing animals and workers on farms including this one.
A gap in authority
The heart of ProPublica’s story is regulatory. USDA told the newsroom that it does not regulate mink and has no “species-specific regulatory authority or dedicated programs” to vaccinate, cull or compensate owners for them. There is no approved H5N1 vaccine for mink. A spokesperson said Congress would have to fund a depopulation programme. By contrast, compensation for culled poultry has cost more than $1 billion since 2022.
That leaves the state. Utah’s state veterinarian, Amanda Price, told ProPublica that culling was never seriously considered, after a fur-trade representative warned it would destroy the business. Instead of a formal quarantine, she issued a “verbal hold” barring the movement of mink, manure or carcasses off the farm, and said she had not visited the property. ProPublica reports that the state did not declare an emergency in part to avoid alerting animal-rights groups. Price has said the hold appears to be containing the outbreak.
Finland and Spain culled mink farms infected with H5N1. Price told ProPublica she knew this but had not studied their reasons.
Workers unwatched
CDC guidance calls for monitoring people exposed during outbreaks, and specifically for testing those with eye redness, which appears in more than 90% of human H5N1 cases according to a study in the New England Journal of Medicine cited by ProPublica. Utah health officials stopped active monitoring of the farm’s workers after agriculture officials passed on complaints from farms. When ProPublica’s reporters met a worker with a visibly red eye, the county health department did not recommend a test. The owner said the worker had dust in his eye, and it cleared within days.
Erin Sorrell of the Johns Hopkins Center for Health Security said no one was leading a coordinated “One Health” effort spanning animal and human health. Neil Vora of the Preventing Pandemics at the Source Coalition called the situation a “clear warning sign”.
Why it matters for India
India has had repeated H5N1 outbreaks in poultry, and has detected the virus in other mammals, including domestic cats and wild cats. It does not have a large fur-farming industry, but it has the world’s largest livestock population and dense human–animal contact in villages and live-bird markets. The National One Health Mission, approved by the Union Cabinet, aims to join up human, animal and environmental surveillance. The Utah case shows why that integration matters in practice: worker testing, genomic sequencing of animal samples, and clear authority over every species that can carry the virus.
