2nd bird flu strain found in US dairy cattle, USDA says

USDA confirms spillover of 2nd H5N1 avian flu genotype into dairy cattle
Until now, all dairy herd H5N1 detections have involved the B3.13 genotype, thought to be the result of a single spillover from wild birds in late 2023 or early 2024. The genotype has been linked to mild infections in dairy workers, along with some poultry cullers, with conjunctivitis the main symptom.
USDA confirms Nevada dairy cows infected with 2nd strain of bird flu
On Jan. 31, 2025, the USDA Animal and Plant Health Inspection Service (APHIS) National Veterinary Services Laboratories (NVSL) confirmed by whole genome sequence the first detection of highly pathogenic avian influenza (HPAI) H5N1 clade 2.
Respiratory symptoms reported in Nevada cows with lethal bird flu strain
At least four cattle herds in Nevada have tested positive for a strain of H5N1 bird flu never before seen in cows, state agriculture officials confirmed Wednesday, and respiratory symptoms like coughing and sneezing have been reported.
Second bird flu strain found in US dairy cattle, USDA says
U.S. dairy cattle tested positive for a strain of bird flu that previously had not been seen in cows, the U.S. Department of Agriculture said on Wednesday, ramping up concerns about the persistent spread of the virus.
Second type of bird flu detected in US dairy cows
Dairy cattle in Nevada have been infected with a new type of bird flu that's different from the version that has spread in herds since last year
Bird Flu Infects Cows For Second Time in Under a Year
Dairy cows in Nevada have been infected with a new strain of bird flu, marking the second strain detected in herds since March.
US dairy cows infected with 2nd form of bird flu for the 1st time: USDA
A second type of bird flu has been found in U.S. dairy cows for the first time, the U.S. Department of Agriculture (USDA) announced on Wednesday.
New Bird Flu Strain Detected In Cows In Nevada
A strain of the H5N1 bird flu virus that has typically spread in poultry and wild birds recently jumped to dairy cattle in Nevada, the Department of Agriculture reported Wednesday, noting the transition is the first time the strain has been detected in cows.
Second bird flu strain detected in dairy cattle for first time; case was in Nevada
U.S. dairy cattle tested positive for a strain of bird flu that previously had not been seen in cows, the U.S. Department of Agriculture said.
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Avian influenza detected in Nevada dairy cattle
Scientists have detected a highly pathogenic type of avian influenza in Nevada dairy cattle, the U.S. Department of ...
Deadly bird flu detected in Nevada dairy cattle
The USDA Animal and Plant Health Inspection Service (APHIS) recently confirmed the deadly bird flu genotype responsible for ...
Scientific American7h
A Second Type of Bird Flu is Circulating in U.S. Ducks—What to Know
Nearly 119,000 birds have been culled at a farm in California after a bird flu called H5N9 was detected among the poultry ...
WATTAgNet12h
Avian flu confirmed in Maryland broiler flock
This is the fifth commercial poultry flock in Maryland to be struck by HPAI in 2025, all of which have involved commercial ...
Cows infected by lethal bird flu strain showing respiratory symptoms, Nevada says
At least four cattle herds in Nevada have tested positive for a strain of H5N1 bird flu never before seen in cows, state ...
The Victoria Advocate8d
APHIS strengthens biosecurity requirements for bird flu related indemnity payments
Poultry producers who have previously had flocks infected with highly pathogenic avian influenza would ... by the current outbreak of the flu. The APHIS interim rule went into effect Dec. 31 ...
WATTAgNet1d
Avian influenza hits California turkey farm
The United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) reported that on ...
Avian influenza found in waterfowl
The Indiana Department of Natural Resources (DNR) confirmed highly pathogenic avian influenza (HPAI) as the cause of death in waterfowl in Gibson County in December and suspects HPAI as the cause of ...
Avian flu has been contained to one north Alabama county, state veterinarian says
In December more than 100,000 birds, nearly all of them chickens, were killed at the Cullman County farm and a backyard flock ...
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Avian flu strikes more Nevada dairy herds, leading to starling removal
The US Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) today confirmed H5N1 avian flu ...