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Oregon - Avian influenza in mammals and livestock 2024-2025

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​https://wahis.woah.org/#/in-review/4451
 
Oregon biologists track ‘concerning’ bird flu outbreak impacting California seal pups

​Updated: Mar 3, 2026 / 11:34 AM PST​
An ODFW spokesperson said the agency will track cases, although they're expected to remain near California's Año Nuevo State Park.​

PORTLAND, Ore. (KOIN) — Oregon scientists are tracking marine mammals after several animals in a neighboring coastline tested positive for a severe disease.​

Last week, the U.S. Department of Agriculture’s National Veterinary Services Laboratory confirmed the presence of highly pathogenic avian influenza in seven elephant seal pups located in California’s Año Nuevo State Park.​

Meghan Dugan, a spokesperson for the Oregon Department of Fish & Wildlife’s Marine Program and West Region, told KOIN 6 the California outbreak is “concerning.”

“Oregon has a small breeding population of northern elephant seals in the state at Cape Arago, on the south coast,” Dugan said. “We hope and expect these H5N1 cases to remain fairly localized to Ano Nuevo State Park in California, as most of the older animals have already moved away from the area prior to clinical signs developing in younger animals. Nevertheless, biologists and stranding network personnel will be tracking any abnormal developments in our marine mammals in the state.”

Dugan noted this is the second time H5N1 has caused illness or death in marine mammals along the Pacific coastline, with the first incident happening in 2023. The National Oceanic and Atmospheric Administration revealed three adult harbor seals in Washington’s Puget Sound had tested positive for the strain that September.
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Dugan has also urged Oregonians to call the West Coast Region Stranding Hotline at 866-767-6114, and keep their distance, if they see deceased, injured or sick mammals along the coast.

https://www.koin.com/local/oregon-c...-flu-outbreak-impacting-california-seal-pups/
 
via email

USDA Confirms Highly Pathogenic Avian Influenza in a Dairy Herd in Oregon​

Milk Supply Safe; Considered Low Risk to Human Health and Safety​

WASHINGTON, D.C., November 10, 2026—Today, the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) National Veterinary Services Laboratories (NVSL) confirmed via PCR (polymerase chain reaction) detection of highly pathogenic avian influenza (HPAI) H5 clade 2.3.4.4b in a dairy cattle herd in Oregon. APHIS will complete genetic sequencing and announce final results as soon as they are available. The affected herd was tested as part of Oregon's ongoing surveillance for HPAI in dairy cattle. Prior to this detection, the herd has consistently tested negative through routine surveillance conducted under the National Milk Testing Strategy program.

This marks the first reported case of HPAI in cattle in Oregon. While dairy cattle in a total of 22 states have been infected since the start of the outbreak in March 2024, APHIS has seen cases in previously unaffected states this year. APHIS is working closely with the Oregon Department of Agriculture to conduct additional on-farm investigations, diagnostic testing, and epidemiological data collection to better understand the detection and prevent further disease spread.

The detection does not change USDA’s HPAI eradication strategy. Biosecurity is still key to mitigating the risk of disease introduction or spread between premises. APHIS recommends enhanced biosecurity measures for all dairy farms. Producers should immediately report any livestock with clinical signs, or any unusual sick or dead wildlife, to their state veterinarian.

This detection does not pose a risk to consumer health or affect the safety of the commercial milk supply. The U.S. Food and Drug Administration is confident that pasteurization is effective at inactivating HPAI virus, and that the commercial, pasteurized milk supply is safe. Dairies are required to send only milk from healthy animals into processing for human consumption; milk from impacted animals is being diverted from the commercial milk tank or destroyed so that it does not enter the human food supply.

According to the U.S. Centers for Disease Control and Prevention (CDC), HPAI viruses circulating in birds and U.S. dairy cattle pose a low risk to the general public in the United States. However, people who have job-related or recreational exposures to infected birds or mammals are at higher risk of infection and should take appropriate precautions outlined in CDC guidance.
 
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