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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/n...0the%20country.
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CDFA Public Notice Regarding H5N9 Strain of Avian Influenza- by CDFA
- January 29, 2025
Highly Pathogenic Avian Influenza (Bird Flu) H5N9 Strain
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.
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https://www.vetmed.ucdavis.edu/news/...vian-influenzaComment
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Additional information from the WOAH report that Lance shared in post #61:
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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.).
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Source: https://www.almanacnews.com/san-mate...-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...
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