『H5N1 Avian Flu Spreads Globally: 175 Million Poultry Culled, Human Cases Rise Amid Ongoing Pandemic Threat』のカバーアート

H5N1 Avian Flu Spreads Globally: 175 Million Poultry Culled, Human Cases Rise Amid Ongoing Pandemic Threat

H5N1 Avian Flu Spreads Globally: 175 Million Poultry Culled, Human Cases Rise Amid Ongoing Pandemic Threat

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 Avian Flu Watch: Global H5N1 Tracker

Welcome to Avian Flu Watch: Global H5N1 Tracker, your data-driven update on the worldwide spread of highly pathogenic avian influenza. Im here to break down the latest numbers, trends, and risks as of mid-December 2025.

Starting with geographic hotspots. In the US, H5N1 has hit all 50 states, with over 175 million poultry depopulated since early 2025, per Infection Control Today reports. Northern Indiana drives ongoing losses, while Washington state confirmed the first fatal human H5N5 case in a backyard flock owner with comorbidities—no human-to-human spread detected, according to Lanvira Flock Watch. Dairy cows remain a concern, with clades B3.13 and D1.1 showing enhanced mammal infectivity.

Europe is in crisis mode. The European Commission logs 577 poultry outbreaks in 2025, surpassing 2023 and 2024 totals, with France hitting 68 since October—nearly 800,000 birds affected, even in vaccinated duck flocks. Germany leads wild bird cases at over 2,800 yearly, plus 460 new ones. The UK reports multiple large commercial outbreaks in December alone: three in England (Kent, Lincolnshire, Norfolk), culling thousands, via GOV.UK updates.

Asia sees resurgent activity. Japan tallied six broiler outbreaks since mid-October, culling 48,000 and 75,000 birds. South Korea hit six laying hen cases, including 130,000 birds. India’s Uttarakhand confirmed five flocks over 21,000 birds; Iraq one after a month gap. China disclosed four unreported pediatric H9N2 cases in October, Lanvira notes.

Africa reemerges: Nigeria’s clustered backyard losses post-five-month silence; South Africa’s Western Cape outbreak killed 150,000 on one farm plus 40 wild birds, per WOAH via Lanvira.

South America’s H5N1 2.3.4.4b clade persists via migratory birds, with phylogroups showing avian-to-poultry and pinniped-to-bird routes. A 2025 Argentine reassortment acquired mammal-adaptive PB2 mutations (Q591K, D701N), spreading to Uruguay, Brazil, and the Falklands, PMC analysis reveals.

Visualize the trends: Upward trend lines in Europe spike post-summer, with 90 new poultry outbreaks in one week. US poultry losses plateau but mammal cases rise—over 200 species affected globally. Comparative stats: 2025 European detections dwarf priors; Americas report from 67 to 81 countries since 2022, CIDRAP warns.

Cross-border patterns scream wild bird migration: Pacific-to-Atlantic spread in South America; clade 2.3.4.4b from Eurasia via birds to Americas. Limited containment wins include UK rapid culls resolving zones quickly, but failures abound—vaccinated French flocks infected, summer lulls masking persistence.

Emerging variants: H5N5 in US humans and Scottish birds; mammal-adapted strains in dairy; fever-resistant H5N1 per new studies. Global groups flag clade 2.3.4.4b’s mammal surge as human threat.

Travel advisories: CDC urges avoiding sick birds, unpasteurized dairy; WHO monitors H5N5. Boost biosecurity, report wild bird die-offs.

Thanks for tuning in to Avian Flu Watch. Join us next week for more. This has been a Quiet Please production—for me, check out Quiet Please Dot AI. Stay vigilant.

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