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California - Avian influenza in poultry 2024-2026
- Thread starter Pathfinder
- Start date
Pathfinder
Editor, Senior Moderator
Commonground
Senior Moderator
January 30, 2025
23 Riverside County dairy and poultry farms test positive for bird flu, health officials say
At least 23 dairy and poultry farms in Riverside County have tested positive for Avian influenza, or bird flu, the virus causing outbreaks in several other areas of the U.S., health officials said Wednesday.
No human cases have been detected in the county but the Riverside University Health System has told local residents to take precautions as a growing number of commercial agriculture facilities and wildlife are exposed to the virus.
continued: https://www.cbsnews.com/losangeles/... confirmed,person transmission in the country.
23 Riverside County dairy and poultry farms test positive for bird flu, health officials say
At least 23 dairy and poultry farms in Riverside County have tested positive for Avian influenza, or bird flu, the virus causing outbreaks in several other areas of the U.S., health officials said Wednesday.
No human cases have been detected in the county but the Riverside University Health System has told local residents to take precautions as a growing number of commercial agriculture facilities and wildlife are exposed to the virus.
continued: https://www.cbsnews.com/losangeles/... confirmed,person transmission in the country.
Pathfinder
Editor, Senior Moderator
CDFA Public Notice Regarding H5N9 Strain of Avian Influenza
Detected for the First Time in California, A Different Strain than H5N1
A commercial duck flock in Merced County, confirmed to have H5N1 bird flu on December 14, 2024, received secondary testing and the final report on January 13, 2025 confirmed the presence of a different, additional strain of bird flu---H5N9. This was reported to the World Organization for Animal Health (WOAH) per protocol and published on January 24, 2025.
This finding is not unexpected or alarming since ducks serve as a reservoir host for influenza A viruses and there is evidence that the H5N9 virus is a North American N9 reassortant of the H5N1 virus that has been seen in wild birds since 2022 with periodic spillover into domestic flocks. The California Department of Food and Agriculture (CDFA) and USDA remain vigilant for any H5 viruses and will continue to monitor for new or unusual viruses as our on-going testing strategy.
Currently, there is no additional information to indicate that this reassortant/strain H5N9 presents any increased risk to public health. There is still no known human-to-human transmission of the bird flu virus. Public health agencies and the Center for Disease Control (CDC) continue to monitor for any impacts from the bird flu strains.
For public inquiries regarding HPAI in California, please call 916-217-7517 or send an email to cdfa.HPAIinfo@cdfa.ca.gov. For media inquiries, please call 916-654-0462 or send an e-mail to OfficeOfPublicAffairs@cdfa.ca.gov.
# # #
https://www.vetmed.ucdavis.edu/news/cdfa-public-notice-regarding-h5n9-strain-avian-influenza
- by CDFA
- January 29, 2025
Detected for the First Time in California, A Different Strain than H5N1
A commercial duck flock in Merced County, confirmed to have H5N1 bird flu on December 14, 2024, received secondary testing and the final report on January 13, 2025 confirmed the presence of a different, additional strain of bird flu---H5N9. This was reported to the World Organization for Animal Health (WOAH) per protocol and published on January 24, 2025.
This finding is not unexpected or alarming since ducks serve as a reservoir host for influenza A viruses and there is evidence that the H5N9 virus is a North American N9 reassortant of the H5N1 virus that has been seen in wild birds since 2022 with periodic spillover into domestic flocks. The California Department of Food and Agriculture (CDFA) and USDA remain vigilant for any H5 viruses and will continue to monitor for new or unusual viruses as our on-going testing strategy.
Currently, there is no additional information to indicate that this reassortant/strain H5N9 presents any increased risk to public health. There is still no known human-to-human transmission of the bird flu virus. Public health agencies and the Center for Disease Control (CDC) continue to monitor for any impacts from the bird flu strains.
For public inquiries regarding HPAI in California, please call 916-217-7517 or send an email to cdfa.HPAIinfo@cdfa.ca.gov. For media inquiries, please call 916-654-0462 or send an e-mail to OfficeOfPublicAffairs@cdfa.ca.gov.
# # #
https://www.vetmed.ucdavis.edu/news/cdfa-public-notice-regarding-h5n9-strain-avian-influenza
Pathfinder
Editor, Senior Moderator
Additional information from the WOAH report that Lance shared in post #61:
...
EPIDEMIOLOGICAL COMMENTS
Highly pathogenic avian influenza (HPAI) H5N9, Eurasian lineage goose/Guangdong clade 2.3.4.4b and HPAI H5N1 clade 2.3.4.4b were confirmed in a commercial duck premises in Merced County, CA. This is the first confirmed case of HPAI H5N9 in poultry in the United States. The USDA Animal and Plant Health Inspection Service (APHIS), in conjunction with State Animal Health and Wildlife Officials, are conducting comprehensive epidemiological investigations and enhanced surveillance in response to the HPAI related events. It should be noted that although this is the first N9 reassortant of North American lineage reported during this event, the use of hemagglutinin (HA) and NA subtyping alone should not be overinterpreted as it is insufficient to understand the geolineage, pathotype, and maintenance of influenza A viruses. Highly pathogenic avian influenza (HPAI) H5N1 clade 2.3.4.4b genotype D1.1, as well as HPAI H5N9 clade 2.3.4.4b genotype Minor101 were identified. The Minor101 genotype is essentially the D1.1 virus with the H5 clade 2.3.4.4b HA gene, but with a North American low pathogenicity virus containing a North American (AM) N9 neuraminidase (NA) gene instead of the AM N1 gene of genotype D1.1. Ducks, both domestic and wild, are natural reservoirs for influenza A virus, and reassortment is not unexpected where more than one influenza A virus is circulating. The ‘D’ genotypes have predominated this fall and winter and have demonstrated frequent reassortment replacing the Eurasian N1 with other AM NA genes. Importantly, this finding is unrelated to recent reports in China of an HPAI H5N9 virus which is an H5 clade 2.3.2.1 (not detected in the U.S.) with the N9 of the Anhui-lineage H7N9 (also never detected in animals in the U.S.).
...
...
EPIDEMIOLOGICAL COMMENTS
Highly pathogenic avian influenza (HPAI) H5N9, Eurasian lineage goose/Guangdong clade 2.3.4.4b and HPAI H5N1 clade 2.3.4.4b were confirmed in a commercial duck premises in Merced County, CA. This is the first confirmed case of HPAI H5N9 in poultry in the United States. The USDA Animal and Plant Health Inspection Service (APHIS), in conjunction with State Animal Health and Wildlife Officials, are conducting comprehensive epidemiological investigations and enhanced surveillance in response to the HPAI related events. It should be noted that although this is the first N9 reassortant of North American lineage reported during this event, the use of hemagglutinin (HA) and NA subtyping alone should not be overinterpreted as it is insufficient to understand the geolineage, pathotype, and maintenance of influenza A viruses. Highly pathogenic avian influenza (HPAI) H5N1 clade 2.3.4.4b genotype D1.1, as well as HPAI H5N9 clade 2.3.4.4b genotype Minor101 were identified. The Minor101 genotype is essentially the D1.1 virus with the H5 clade 2.3.4.4b HA gene, but with a North American low pathogenicity virus containing a North American (AM) N9 neuraminidase (NA) gene instead of the AM N1 gene of genotype D1.1. Ducks, both domestic and wild, are natural reservoirs for influenza A virus, and reassortment is not unexpected where more than one influenza A virus is circulating. The ‘D’ genotypes have predominated this fall and winter and have demonstrated frequent reassortment replacing the Eurasian N1 with other AM NA genes. Importantly, this finding is unrelated to recent reports in China of an HPAI H5N9 virus which is an H5 clade 2.3.2.1 (not detected in the U.S.) with the N9 of the Anhui-lineage H7N9 (also never detected in animals in the U.S.).
...
Pathfinder
Editor, Senior Moderator
Last edited:
Pathfinder
Editor, Senior Moderator
Pathfinder
Editor, Senior Moderator
Shiloh
Editor, Senior Moderator
Source: https://www.almanacnews.com/san-mat...rmed-in-backyard-poultry-in-san-mateo-county/
Bird flu confirmed in backyard flock in San Mateo County
San Mateo County officials warn of risks to poultry keepers as bird flu continues to spread
Hannah Bensen 26 minutes ago
H5N1, known as bird flu, has been detected in a backyard poultry flock in the city of San Mateo, a representative from the San Mateo County Health department said Thursday following a notice of the case from the California Department of Food and Agriculture published on Monday, Feb. 3...
Bird flu confirmed in backyard flock in San Mateo County
San Mateo County officials warn of risks to poultry keepers as bird flu continues to spread
Hannah Bensen 26 minutes ago
H5N1, known as bird flu, has been detected in a backyard poultry flock in the city of San Mateo, a representative from the San Mateo County Health department said Thursday following a notice of the case from the California Department of Food and Agriculture published on Monday, Feb. 3...
Pathfinder
Editor, Senior Moderator
Pathfinder
Editor, Senior Moderator
Pathfinder
Editor, Senior Moderator
Related to the post above:
August 18, 2024: Highly Pathogenic Avian Influenza (Bird Flu) Detected in a California Retail Poultry Flock in Los Angeles County
Sacramento, CA – Following an investigation by the California Department of Food and Agriculture (CDFA), the U.S. Department of Agriculture's (USDA) National Veterinary Services Laboratories (NVSL) has confirmed highly pathogenic avian influenza (HPAI) in a retail poultry flock in Los Angeles County. This is the first detection of HPAI in domestic poultry since California was self-declared HPAI free on July 20th, 2025. All national detections of HPAI in poultry can be found at: 2022–2024 Detections of Highly Pathogenic Avian Influenza (usda.gov).
California has several poultry health programs in place that prove effective in our early detection and disease monitoring strategy. This detection is an example of one of our program’s effectiveness. This particular program depends on the cooperation of select poultry owners, who volunteer to have their birds tested monthly. Through this testing program, we look for diseases of concern including virulent Newcastle disease and highly pathogenic avian influenza (HPAI). Through routine testing, we were able to confirm HPAI before sick birds were reported and our Emergency Animal Health Responders were able to act rapidly to prevent the spread. The retailer’s proactive approach for routine surveillance testing through CDFA has proved a great service to our California communities.
This HPAI virus spreads easily between birds and is lethal to poultry, so infected flocks are quarantined and euthanized, followed by cleaning and disinfection of the property. The disease is spread through movement of infected or exposed birds, direct or indirect contact with infected wild and domestic birds or contact with virus on fomites (surfaces) such as hands, shoes, clothing, or feet and the fur of rodents and other animals exposed to infected birds or cattle. The source of infection in this flock is currently unknown and under investigation. Testing of other farms will be conducted over the next several weeks to determine the extent of spread. We strongly urge all poultry owners in California to protect their flocks by increasing their biosecurity practices. Recommended biosecurity practices can be found on the CDFA and USDA websites.
Clinical signs of HPAI include sudden death, trouble breathing, clear runny discharge (from nose, mouth, and eyes), lethargy, decreased food and water intake, swelling (eyes, head, wattles, or combs), discolored or bruised comb, wattles, or legs, stumbling/falling, or a twisted neck. For more information and updates, please visit our CDFA Avian Health Program webpage. Poultry owners with flocks that have experienced any unusual/suspicious illness or deaths should call our CDFA Sick Bird Hotline at 866-922-BIRD (2473).
...
https://www.cdfa.ca.gov/ahfss/Animal_Health/Avian_Influenza.html
August 18, 2024: Highly Pathogenic Avian Influenza (Bird Flu) Detected in a California Retail Poultry Flock in Los Angeles County
Sacramento, CA – Following an investigation by the California Department of Food and Agriculture (CDFA), the U.S. Department of Agriculture's (USDA) National Veterinary Services Laboratories (NVSL) has confirmed highly pathogenic avian influenza (HPAI) in a retail poultry flock in Los Angeles County. This is the first detection of HPAI in domestic poultry since California was self-declared HPAI free on July 20th, 2025. All national detections of HPAI in poultry can be found at: 2022–2024 Detections of Highly Pathogenic Avian Influenza (usda.gov).
California has several poultry health programs in place that prove effective in our early detection and disease monitoring strategy. This detection is an example of one of our program’s effectiveness. This particular program depends on the cooperation of select poultry owners, who volunteer to have their birds tested monthly. Through this testing program, we look for diseases of concern including virulent Newcastle disease and highly pathogenic avian influenza (HPAI). Through routine testing, we were able to confirm HPAI before sick birds were reported and our Emergency Animal Health Responders were able to act rapidly to prevent the spread. The retailer’s proactive approach for routine surveillance testing through CDFA has proved a great service to our California communities.
This HPAI virus spreads easily between birds and is lethal to poultry, so infected flocks are quarantined and euthanized, followed by cleaning and disinfection of the property. The disease is spread through movement of infected or exposed birds, direct or indirect contact with infected wild and domestic birds or contact with virus on fomites (surfaces) such as hands, shoes, clothing, or feet and the fur of rodents and other animals exposed to infected birds or cattle. The source of infection in this flock is currently unknown and under investigation. Testing of other farms will be conducted over the next several weeks to determine the extent of spread. We strongly urge all poultry owners in California to protect their flocks by increasing their biosecurity practices. Recommended biosecurity practices can be found on the CDFA and USDA websites.
Clinical signs of HPAI include sudden death, trouble breathing, clear runny discharge (from nose, mouth, and eyes), lethargy, decreased food and water intake, swelling (eyes, head, wattles, or combs), discolored or bruised comb, wattles, or legs, stumbling/falling, or a twisted neck. For more information and updates, please visit our CDFA Avian Health Program webpage. Poultry owners with flocks that have experienced any unusual/suspicious illness or deaths should call our CDFA Sick Bird Hotline at 866-922-BIRD (2473).
...
https://www.cdfa.ca.gov/ahfss/Animal_Health/Avian_Influenza.html
Commonground
Senior Moderator
Hong Kong
Import of poultry meat and products from Los Angeles County of State of California in US suspended
The Centre for Food Safety (CFS) of the Food and Environmental Hygiene Department announced today (August 25) that in view of a notification from the World Organisation for Animal Health (WOAH) about an outbreak of highly pathogenic H5N1 avian influenza in Los Angeles County of the State of California in the United States (US), the CFS has instructed the trade to suspend the import of poultry meat and products (including poultry eggs) from the area with immediate effect to protect public health in Hong Kong.
A CFS spokesman said that according to the Census and Statistics Department, Hong Kong imported about 24 650 tonnes of chilled and frozen poultry meat and about 1.61 million poultry eggs from the US in the first six months of this year.
"The CFS has contacted the American authority over the issue and will closely monitor information issued by the WOAH and the relevant authorities on the avian influenza outbreak. Appropriate action will be taken in response to the development of the situation," the spokesman said.
Ends/Monday, August 25, 2025
Issued at HKT 19:00
https://www.info.gov.hk/gia/general/202508/25/P2025082500660.htm
Import of poultry meat and products from Los Angeles County of State of California in US suspended
The Centre for Food Safety (CFS) of the Food and Environmental Hygiene Department announced today (August 25) that in view of a notification from the World Organisation for Animal Health (WOAH) about an outbreak of highly pathogenic H5N1 avian influenza in Los Angeles County of the State of California in the United States (US), the CFS has instructed the trade to suspend the import of poultry meat and products (including poultry eggs) from the area with immediate effect to protect public health in Hong Kong.
A CFS spokesman said that according to the Census and Statistics Department, Hong Kong imported about 24 650 tonnes of chilled and frozen poultry meat and about 1.61 million poultry eggs from the US in the first six months of this year.
"The CFS has contacted the American authority over the issue and will closely monitor information issued by the WOAH and the relevant authorities on the avian influenza outbreak. Appropriate action will be taken in response to the development of the situation," the spokesman said.
Ends/Monday, August 25, 2025
Issued at HKT 19:00
https://www.info.gov.hk/gia/general/202508/25/P2025082500660.htm