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State records released under Utah's public records law show that a mink farm hit by H5N1 bird flu expects to lose about 80% of its animals, and that state officials decided against placing the property under quarantine. The Animal Welfare Institute, an advocacy group, obtained the documents from the Utah Department of Agriculture and Food (UDAF) and published them on September 17, describing the case as the first documented outbreak of highly pathogenic bird flu in captive mink in the United States. The Salt Lake Tribune reported on the records on September 27.

The 80% figure is a projection recorded in agency correspondence, not a confirmed death count. Utah officials have not publicly said how many mink have died, how many the farm holds or where it is located. In its response letter and released records, UDAF said it redacted or withheld portions under state exemptions for records used to identify, trace or control livestock diseases and for material that could interfere with an ongoing investigation.

The case matters beyond one farm. Mink are highly susceptible to influenza viruses, and virologists have long warned that crowded fur farms give bird flu repeated chances to adapt to mammals. For Utah residents, the more immediate questions are what officials are doing to contain the virus and why so little has been disclosed.

Inside the Records Utah Released

The Animal Welfare Institute's request, dated August 26, sought all UDAF records on highly pathogenic avian influenza in American mink in Utah from June 1 onward, and the department responded on September 10. According to the group's summary of the records, the outbreak had been moving through the farm since early August, with animals dying slowly.

State officials weighed a quarantine but decided against it, saying they had "no idea what the criteria would be to release it," the group reported. The department also reasoned that no live animals leave the farm. One official described the remaining choices as a decision to "watch them die or get emergency vaccine approval."

A letter to federal officials included in the release, signed by Utah Agriculture Commissioner Kelly Pehrson and State Veterinarian Amanda Price, asked the U.S. Department of Agriculture (USDA) to cover the farm's losses through federal livestock disaster programs and to allow emergency vaccination of the surviving mink. The letter said national incident commanders had told the state veterinarian there was no leadership support for federal indemnity because mink are not considered livestock under USDA programs, even though Utah law treats them as livestock. It also noted that a state disaster loan option would require an emergency declaration, which "may alert animal rights groups to the outbreak." As of September 4, the date of the latest records, the advocacy group said it did not appear any vaccine had been provided.

Federal data confirm the infections but little else. Utah has seven USDA-confirmed H5N1 cases in captive mink, Wisconsin Public Radio reported, citing the agency's mammal detections dashboard. A UDAF spokesperson told the station that all of the cases are related but declined to say whether they were on the same farm, adding that state and federal animal health officials were working closely with the affected producer.

Why Mink Worry Virologists

Scientists watch mink closely because the animals are susceptible to both influenza viruses and coronaviruses, and dense farms allow a virus to pass rapidly from animal to animal. The Animal Welfare Institute notes that a mink's upper respiratory tract is physiologically similar to a human's, which is why mutations that help a virus spread in mink raise public health concern.

The clearest precedent came from Spain. In October 2022, H5N1 struck a single farm holding more than 50,000 mink in Galicia, according to a report in Eurosurveillance. Investigators found an uncommon mutation in the virus's PB2 gene with potential public health implications, and the evidence suggested the virus may have spread from mink to mink. The farm's animals were culled, and none of the exposed workers tested positive. H5N1 was also detected on multiple fur farms in Finland in 2023.

Keith Poulsen, head of Wisconsin's state veterinary diagnostic laboratory, told WPR the Utah detection was not a real surprise. Beyond exposure to wild birds, he said, mink are obligate carnivores and "could be eating rendered meat product from the poultry industry." Utah reported bird flu on poultry and dairy farms as recently as late July, and it is the nation's second-largest mink pelt producer after Wisconsin, which produced more than four times Utah's pelt output in 2024.

Quarantine, Vaccines and the Transparency Gap

The Animal Welfare Institute argues the records show neither state nor federal officials had a response plan for mink, and that skipping a quarantine overlooked risks from workers, equipment, wild birds, escaped animals and carcasses. Kate Dylewsky, the group's assistant director of government affairs, said the records show "an unacceptable lack of preparation for such a hazardous event." Readers should weigh that criticism with its source in mind: the group is backing the Mink VIRUS Act, a House bill sponsored by Rep. Adriano Espaillat that would phase out U.S. mink farming within a year and compensate farmers.

Agencies routinely withhold farm locations, and a UDAF spokesperson told a television newsroom in August that exact locations could not be shared for privacy reasons. Still, the result is that the public knows more about this outbreak from an advocacy group's records request than from any state or federal announcement, a gap that makes independent risk assessment difficult. Poulsen told WPR he worries that federal attention may be focused elsewhere, such as on New World screwworm, or that federal staffing reductions could be a factor, though he offered that as a concern rather than a finding.

Risk to Utah Residents, Pets and Wildlife

The Centers for Disease Control and Prevention says the current public health risk from H5 bird flu is low. Its situation page, last updated in March, lists 71 human cases reported in the United States since February 2024, with sporadic infections mainly among dairy and poultry workers. There is no public report of anyone being infected in connection with the Utah mink farm.

The people with the most exposure are farm workers, veterinarians, and anyone handling mink carcasses or waste. Nearby wildlife and outdoor pets face a separate risk, mainly from contact with infected birds or animal remains. Residents should avoid touching sick or dead wild birds and mammals and report them to the Utah Division of Wildlife Resources. Pet owners should keep cats and dogs away from carcasses and consider the risks of raw pet food. Anyone who develops eye redness or flu-like symptoms after animal exposure should contact a health care provider and mention that exposure.

Health agencies have not issued any new food guidance tied to this outbreak. Standard advice still applies: cook poultry and eggs thoroughly and choose pasteurized dairy. Farm workers should use the protective equipment their employers and health officials recommend.

Questions Still Unanswered

The most important facts remain unconfirmed. Officials have not disclosed the farm's location or size, the actual number of deaths, how the virus entered, whether USDA approved any vaccine, or how carcasses are being handled. Publicly available information also does not show whether the virus picked up mammal-adapting mutations while circulating in the mink.

Utah officials may release more records, and the USDA dashboard could add detections if the virus spreads. Congress is also weighing Farm Bill language that, according to the Animal Welfare Institute, would let the mink industry receive federal funds to expand into international markets. Nature World News will update this story if UDAF or USDA responds on the record.

A Utah mink farm expects most of its animals to die of H5N1, and officials have shared few details beyond what a records request brought into view. The CDC still rates the risk to the public as low, but the limited disclosure leaves open questions that only state and federal agencies can answer.

What Readers Want to Know

What happened at the Utah mink farm?

H5N1 bird flu was confirmed in captive mink in Utah in August. State records obtained by the Animal Welfare Institute show the farm expects to lose about 80% of its mink and that officials decided against a quarantine.

Is the 80% figure a confirmed death toll?

No. It is a projection recorded in agency correspondence. Utah officials have not publicly released the number of mink that have died or the size of the farm.

Where is the farm?

Officials have not disclosed its location. The state redacted or withheld portions of the records under exemptions for livestock disease control and ongoing investigations, and a spokesperson has said exact locations cannot be shared for privacy reasons.

Is bird flu from mink a risk to people in Utah?

The CDC says the current public health risk from H5 bird flu is low. People with direct exposure to infected animals, such as farm workers and veterinarians, face a higher risk than the general public.

Why do scientists worry about mink farms?

Mink are highly susceptible to influenza, and crowded farms let viruses spread between animals. A 2022 outbreak on a Spanish mink farm produced an uncommon mutation that researchers flagged for potential public health implications.

What should residents do?

Avoid handling sick or dead wild birds and animals, report them to the Utah Division of Wildlife Resources, keep pets away from carcasses, and seek medical advice if symptoms follow an animal exposure.