Bird Flu Update: US H5N1 News Now
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Host: Good evening, and welcome to Bird Flu Update: US H5N1 News Now. I'm your host, bringing you the latest on avian influenza developments in the United States. Today, we're covering confirmed cases, agency updates, guidance changes, key research, what it means for you, and a comparison to recent weeks.
Starting with human cases: The CDC reports no new confirmed H5N1 infections in people since their streamlined updates on July 7, 2025. Through November 29, 2025, surveillance systems show no unusual flu activity in humans, including H5 viruses. Probable cases follow updated CDC guidelines from January 2025, but none have been added recently.
In animals, USDA data via APHIS confirms ongoing detections. Wild birds saw HPAI H5 in Colorado's El Paso County from December 3 to 12, 2025, and Minnesota's Ramsey County over the same period. CIDRAP notes 108 flocks affected in the past 30 days across five states, including 44 commercial and 64 backyard, impacting 1.16 million birds. Dairy cattle outbreaks continue, with AVMA reporting new cases in Nevada and Arizona identified via silo milk testing under the National Milk Testing Strategy, which ramped up December 16, 2025, now involving 45 states.
From the past week: CDC's H5 page, last updated post-July, integrates bird flu into routine flu reports, dropping monthly animal data from their site to USDA's. USDA's NMTS requires raw milk silo samples nationwide, complementing earlier orders, with positive herds mandated to report. AVMA's December 16 update highlights California's emergency declaration from December 2024 still aiding responses. No major new USDA or CDC alerts this week, but FDA emphasizes pasteurization's effectiveness.
Guidance and containment: USDA offers biosecurity funding and milk loss compensation for affected producers. A second federal order since December 6, 2024, mandates silo testing. Canada tightened US dairy cattle imports.
Research highlights: FDA funds thermal inactivation studies with Cornell and NIH partners on non-standard pasteurization in milk, plus cheese aging inactivation and raw milk waste disposal. They're exploring genome-edited chickens at University of Wisconsin-Madison for H5N1 resistance. Their August 2024 retail dairy survey of 167 samples found no viable virus, reinforcing pasteurization safety, per Journal of Food Protection.
For listeners: The commercial milk supply remains safe due to pasteurization inactivating H5N1, as confirmed by FDA, USDA, and CDC testing. Avoid raw milk, sick birds, or unpasteurized dairy. Farm workers: Use PPE and report symptoms. No human-to-human spread detected; risk to public is low.
Compared to previous weeks: Outbreaks persist in poultry and dairy but at lower intensity than peak 2024-early 2025, with successful containment per recent reports. Flock losses are down from millions earlier, and NMTS caught pre-symptomatic cases, unlike prior surges. Human cases flat since mid-2025.
The US has largely contained the 2025 outbreak, shifting to surveillance.
Thanks for tuning in. Come back next week for more. This has been a Quiet Please production. For me, check out Quiet Please Dot A I.
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