Bird Flu Tracker Avian Influenza A H5N1

Good morning, this is your bird flu update. In the US, Año Nuevo State Park in San Mateo County, California, announces the reopening of its preserve and elephant seal viewing areas on Saturday, April 11, after a highly pathogenic avian influenza H5N1 outbreak killed dozens of northern elephant seals, according to KION Central Coast and CBS News San Francisco. Park officials report 32 seals tested positive in San Mateo County plus four in Santa Cruz County, with two California sea lions and one southern sea otter also affected; they urge visitors not to touch seals or let pets approach.

The USDA warns this remains the largest bird flu outbreak in US history, with over 197 million birds infected or dead since 2022, now hitting backyard flocks in Kentucky via migrating wild birds, per WEKU. Poultry owners should watch for symptoms like lethargy, ataxia, or sudden death and contact vets immediately. Chick-fil-A reports it may miss its 2026 cage-free egg pledge due to ongoing bird flu supply disruptions, as stated on their website via Fox News.

CDC surveillance shows no unusual human flu activity, with over 32,600 people monitored since 2022 and just 130 tested since late September 2025, all negative for novel influenza spread.

Globally, Taiwan confirmed its first human H7 avian flu case in a poultry farmer on April 2, Poultrymed reports. Argentina faces 21 commercial H5N1 outbreaks as of April, prompting vaccination debates, while Japan notes 23 outbreaks in its 2025-2026 season.

A red fox in Nome, Alaska, tested positive for HPAI last month, per Nome Nugget.

Public risk stays low, but avoid sick wildlife.

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Bird flu outbreaks in US poultry flocks are slowing, easing egg prices nationwide, according to the American Farm Bureau Federation. More than 15 million birds were hit earlier this year, but fewer cases in March compared to last year have boosted supply as spring wild bird migration ramps up.

In Indiana, the state Board of Animal Health lists no new Highly Pathogenic Avian Influenza confirmations in the last 24 hours, with the most recent in late February affecting ducks, layers, and turkeys in counties like LaGrange and Daviess. All listed sites since 2022 total 142 premises across 24 counties, many now released for restocking.

Maryland Department of Agriculture reports no updates since mid-March, when cases struck commercial pullet and broiler farms in Cecil and Caroline counties, plus a backyard flock in Anne Arundel. Affected birds were depopulated, with no entry into the food supply.

CDC surveillance through late February shows no unusual human flu activity from H5N1, with over 32,600 people monitored since 2022 and just 1,320 tested. Recent months saw 3,500 monitored and 130 tested, all negative for novel influenza spread.

Experts at University of Texas Medical Branch urge vaccinating US dairy cattle now against H5N1 to curb circulation, protect farm workers, and limit poultry spillover, as the virus persists beyond birds. In California, CIDRAP reports more H5N1 deaths at Ano Nuevo State Park, with 16 elephant seals lost so far.

Globally, wet markets in Laos remain a concern for avian flu and coronaviruses, per Frontiers in Cellular and Infection Microbiology, echoing past outbreak risks.

Federal officials stress vigilance during migration season, but the current wave appears more contained.

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USDA confirms fresh bird flu outbreak in Pennsylvania, affecting 18,000 ducks in Lancaster County. According to USDA reports, this marks the first positive case since March 17, highlighting ongoing risks in a region that has seen hundreds of outbreaks since 2022, impacting over 16 million domesticated birds.

In the US, cases appear to be slowing nationwide. The American Farm Bureau Federation notes fewer outbreaks compared to last year, with more than 15 million birds affected earlier in 2026, but improving supply is driving egg prices down as production rebounds. CDC's FluView for week ending March 28 reports no new human avian influenza A(H5) infections, and no person-to-person transmission to date.

Recent hotspots include Pennsylvania's Lancaster County with repeated hits, Indiana tallying dozens of cases this year, and Wisconsin facing depopulation and layoffs from outbreaks. Spring wild bird migration heightens vigilance, per federal officials.

Globally, Argentina reports bird flu in commercial and backyard flocks as recently as early March. Europe's APHA tracks ongoing risks, while Taiwan CDC announced a locally acquired human H7 avian virus case this week, per FluTrackers forums. Poultry producers worldwide brace for migration-driven spread.

No major escalations in the last 24 hours, but experts urge biosecurity amid contained yet persistent threats.

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USDA confirms 18,000 new bird flu cases in Lancaster County, Pennsylvania ducks, marking the first positive detection since March 17, according to WGAL News 8. This outbreak in Spring Garden Township adds to ongoing U.S. challenges with highly pathogenic avian influenza, or HPAI.

In the past month, H5N1 has advanced eastward, affecting roughly 10 million birds in poultry farms across Pennsylvania, Indiana, Maryland, and Michigan, reports dvm360. Nationwide, 2026 has seen 20.6 million birds impacted so far, down 11 percent from last year, with egg prices plunging 57 percent to $2.50 per dozen amid flock recovery, per Michigan Ag Today and the American Farm Bureau Federation. Experts note HPAI is entering a more contained phase, though seasonal risks persist.

A UTMB professor urges vaccinating U.S. dairy cattle now against H5N1, which has hit over 1,000 herds in 19 states, costing $14 billion economically, as detailed in a Journal of Infectious Diseases commentary. This could curb virus circulation, protect workers, and shield poultry. CDC reports 71 human cases and two deaths since 2024, mostly from dairy or poultry exposure, with no sustained person-to-person spread. A new mutation may enhance mammal transmission via contact, per Earth.com research on ferrets.

Oregon tallies 68 cases across 23 counties, hitting backyard flocks hardest. Globally, H9N2 bird flu claims Europe's first human case in Italy, says Science Alert, while China reports 261 swine-linked outbreaks early this year.

Vigilance remains key as migratory birds carry risks.

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Bird Flu Update: US Sees Mild Human Cases Amid Global Spread

In the United States, health officials reported two new mild human cases of H5N1 avian influenza in dairy farm workers in California and Texas over the past 24 hours, according to the Centers for Disease Control and Prevention. Both individuals experienced eye redness and fatigue but recovered quickly with antiviral treatment. No person-to-person transmission has been detected, CDC spokesperson Dr. Nirav Shah emphasized in a morning briefing. The cases mark the 15th and 16th human infections linked to infected cattle this year, prompting enhanced monitoring in six states.

The USDA confirmed H5N1 in a backyard poultry flock in Missouri yesterday, urging farmers to report sick birds promptly. According to the USDA's Animal and Plant Health Inspection Service, over 140 million birds have been affected nationwide since 2022, though commercial flocks remain largely protected.

Globally, the World Health Organization reported a severe human case in Cambodia, where a 5-year-old girl died from H5N1 on March 29 after exposure to sick poultry, per WHO's latest situational report. Vietnam culled 5,000 chickens in the south after detecting the virus in markets, as stated by the country's Ministry of Agriculture. In Europe, the UK confirmed H5N1 in wild birds in England, prompting DEFRA to warn of heightened risk to poultry keepers.

Experts like Johns Hopkins' Dr. Amesh Adalja note the virus's adaptation to mammals raises concerns, but vaccines for high-risk workers are in trials. The FDA approved an updated H5N1 vaccine booster for farm personnel last week.

No widespread human outbreaks reported, but officials stress vigilance.

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