Bird Flu Tracker Avian Influenza A H5N1

Bird flu outbreaks continue to challenge US poultry operations, with Pennsylvania hit hardest in recent weeks. The USDA Animal and Plant Health Inspection Service confirmed multiple H5N1 detections this week in Lancaster County egg-layer and turkey facilities, affecting over 7 million birds across 11 commercial flocks and nine backyard flocks since early February, according to Farm Progress and CIDRAP reports. One site alone lost 2.6 million egg-layers, marking an unprecedented surge in the state.

Nationally, since the outbreak began, HPAI has impacted 190 million birds in 2,072 flocks across 50 states, per Washington State Department of Agriculture's February 17 update. In the last 30 days, 51 flocks were confirmed positive, including 23 commercial and 28 backyard, with 8.97 million birds affected. Washington's latest domestic case was February 2 in Yakima County backyard flocks, while wild bird detections persist through mid-February.

Human cases remain low risk, CDC reports on February 18. Since 2024, 71 US cases have been confirmed, mostly among dairy and poultry workers, with 41 linked to cattle herds—38 in California—and two deaths, including Louisiana's first. No person-to-person spread detected. Washington state tallies 12 cases, all tied to poultry.

Fresh developments emerged yesterday: San Juan County, Washington, announced two red foxes on San Juan Island tested positive for avian influenza on February 20, with no human links confirmed yet.

No new livestock cases nationwide in the past 30 days, and CDC surveillance shows steady monitoring of animal exposures.

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Bird Flu Update: US Poultry Hits Hard as Cases Surge in East Coast States

In the latest developments on highly pathogenic avian influenza, or bird flu, Maryland confirmed a presumptive positive H5 case on a commercial broiler farm in Wicomico County on February 14, according to the Maryland Department of Agriculture. This marks the second outbreak in the state this year, with affected birds quarantined and depopulated to curb spread. Officials stress the low risk to the public but urge strict biosecurity like disinfecting equipment and limiting farm visitors.

Pennsylvania is ramping up its response amid a spike, with Governor Josh Shapiro announcing extra personnel, expanded testing at PADLS labs—which processed 8,000 tests on 80,000 birds in recent weeks—and USDA support. Since 2022, the state has lost over 14.3 million birds, half this year alone, Shapiro's office reports. Producers are advised to monitor flocks and report illnesses immediately.

New Jersey faces growing concerns after over 1,100 dead or sick wild birds, mostly Canadian geese, reported February 14-16, per the Department of Environmental Protection. Thousands of geese deaths prompted park closures in Gloucester and Monmouth counties, with confirmations across eight counties since August 2025, WHYY News reports. No human cases confirmed, but officials warn against touching dead birds.

Nationally, CDC's Week 5 flu report through February 7 shows no new H5 human infections, with overall influenza positivity at 18.6% and rising hospitalizations at 67 per 100,000—second highest since 2010-11. Poultry remains safe if cooked properly.

In California, experts note the virus lingers in cooler weather, driving waterfowl near backyard flocks, UCANR warns on February 17.

Health officials worldwide emphasize vigilance as wild bird migration fuels outbreaks.

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Bird flu cases are surging across the US and globally, with over 4.8 million birds affected in January and early February alone, according to USDA data reported by Sentient Media. In the past week, major outbreaks hit a Colorado facility with 1.3 million birds culled, a Pennsylvania farm losing 1.5 million, and a presumptive positive H5 case confirmed on a commercial broiler farm in Maryland's Wicomico County on February 14, as announced by the Maryland Department of Agriculture.

Arkansas agencies warned on February 16 via KATV that the public should avoid wild birds after statewide detections in wild birds and backyard flocks, citing low but serious human risk with flu-like symptoms. Experts like Colorado State Veterinarian Maggie Baldwin emphasize enhanced biosecurity, though experts such as UC Davis's Maurice Pitesky call for better outward-facing surveillance of wild waterfowl habitats.

Internationally, Cambodia reported its first H5N1 human case of 2026 on February 14, Xinhua stated—a 30-year-old man from Kampot province who recovered after exposure to dead chickens at home. China's Hong Kong Centre for Health Protection noted three new human cases on February 11 per CIDRAP: two H9N2 and one H10N3, with symptom onsets in late December and January. H5N1 also caused Antarctica's first confirmed wildlife die-off, killing over 50 skuas, as detailed in a ScienceDaily release.

No new US human cases emerged in the last 24 hours, and CDC's latest flu report shows seasonal influenza dominating, not avian strains. Poultry culling continues amid calls for vaccines, stalled by trade and mutation fears.

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Bird flu cases are surging across the US and globe, with over 4.8 million birds affected in January and early February alone, according to USDA data reported by Sentient Media. In the last 24 hours, fresh outbreaks hit Pennsylvania's Lancaster County, where a commercial egg-layer facility lost 104,800 birds, a turkey farm 36,000, and another poultry site 25,100, per CIDRAP. Sonoma County, California, confirmed 86,600 birds impacted at a broiler facility.

Colorado declared a disaster after 1.3 million birds were culled at one site, while Pennsylvania saw 1.5 million more affected recently, Sentient Media notes. Utah officials reported nearly 50 wild bird carcasses testing positive since October, urging removal of backyard feeders to protect domestic flocks, KUTV states. Wild mammals aren't spared: two foxes in Los Angeles and Connecticut, a cat in New Jersey, and a skunk in Colorado's Pueblo County tested positive this week, per CIDRAP and local reports.

States like Arkansas, Texas, and Colorado issued warnings Friday against touching dead wild birds or mammals, as migrating waterfowl drive seasonal spikes from November to March, experts at UC Davis tell Sentient Media. Globally, Poland culled millions of chickens early this year, Europe confirmed its first cow case in the Netherlands, and H5N1 killed over 50 skuas in Antarctica for the first time, ScienceDaily reported February 12.

No new human cases in the past day; CDC says risk remains low, with 71 US cases total as of late January per HPJ. Poultry culling continues amid calls for vaccines and better biosecurity, though trade fears stall progress.

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Bird flu outbreaks continue to surge across the US, with fresh detections in Colorado and Pennsylvania hitting millions of birds. The USDA's Animal and Plant Health Inspection Service reports 1.3 million commercial table egg layers sickened in Weld County, Colorado, alongside 722,000 birds on a Lancaster County, Pennsylvania farm and smaller flocks totaling 70,000 there. Philadelphia live-bird markets lost 500 animals, while South Dakota's Charles Mix County saw 71,800 turkeys infected. Over the past 30 days, 59 flocks nationwide—19 commercial and 40 backyard—have been affected, involving 4.9 million birds, per CIDRAP.

Human cases remain low risk, with CDC tallying 71 confirmed or probable infections since 2024, mostly among dairy and poultry workers. California leads with 38 cases, followed by Washington at 12 and Colorado at 10. No new US human cases reported in the last 24 hours, and surveillance of over 22,600 exposed individuals has yielded 64 detections.

Globally, H5N1 struck Antarctica for the first time, killing over 50 skuas in 2023-2024 summers, according to a new Scientific Reports study by Erasmus MC and UC Davis. The virus caused severe neurological symptoms in the seabirds at sites like Beak Island, raising alarms for further spread amid climate pressures.

The ongoing outbreak, now in its fourth year since 2022, disrupts poultry supplies and egg prices, with wild waterfowl driving seasonal resurgences, as noted by Texas A&M experts.

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