Bird Flu Tracker Avian Influenza A H5N1

# Bird Flu Update

Health authorities across the United States continue monitoring avian influenza activity as new cases emerge in livestock and poultry operations. The CDC reports no new human cases of bird flu this week, maintaining the current situation where human-to-human transmission of H5 virus has not been identified in the United States.

On the animal front, Idaho dairy herds have tested positive for H5N1 avian flu, marking the first cattle detections since December 2025. According to the USDA Animal and Plant Health Inspection Service, over the past 30 days, 41 confirmed avian flu outbreaks were documented across domestic flocks, including 27 in commercial settings and 14 in backyard premises, affecting 1.6 million birds. Recent commercial poultry operations reporting outbreaks include facilities in South Dakota and Arkansas, with the Arkansas outbreak impacting over 191,000 broiler chickens.

In Southeast Georgia, a highly pathogenic avian influenza case was confirmed in a backyard flock of approximately 60 birds in Pierce County. Officials believe the virus likely came from contact with wild birds. The flock has been depopulated to prevent further spread, with no commercial poultry or dairy operations within six miles of the affected site.

On the vaccine front, Moderna announced Tuesday that the first participants in the United States and United Kingdom have received doses in a Phase 3 trial of its H5 messenger RNA vaccine candidate, mRNA-1018. The study aims to enroll about 4,000 healthy adults. This development comes after the Trump administration canceled hundreds of millions in government contracts with Moderna in May 2025. The Coalition for Epidemic Preparedness Innovations has since stepped in with up to 54.3 million dollars in funding support. Notably, most trial work is taking place in the United Kingdom, with 3,000 of 4,000 volunteers and 26 of 36 trial sites located there.

Meanwhile, the CDC reports that seasonal influenza activity continues to decrease nationwide. The agency estimates at least 31 million illnesses, 380,000 hospitalizations, and 23,000 deaths from seasonal flu during the current 2025-2026 season. Approximately 135 million doses of influenza vaccine have been distributed across the United States.

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A Washington state resident, an older adult with underlying health conditions, has died from a rare H5N5 bird flu strain, marking the first U.S. human case since February and the first of this type ever reported in humans, according to CBS News health officials. This comes amid ongoing H5N1 outbreaks ravaging U.S. livestock, with the USDA's Animal and Plant Health Inspection Service confirming avian flu in five Idaho dairy herds this week, the first cattle detections since December 2025 in Wisconsin, CIDRAP reports. Over the past 30 days, 41 outbreaks hit domestic flocks, killing 1.6 million birds across 27 commercial and 14 backyard sites.

In the last 24 hours, no new human bird flu cases were reported in the U.S. or globally, per CDC's weekly surveillance and health monitoring updates, with H5N1 remaining stable and no person-to-person transmission identified. Poultry losses continue, including new cases in South Dakota turkey facilities affecting 60,000 birds, one Arkansas broiler site with 191,200 birds, a Georgia backyard flock in Pierce County, and spreading threats in Indiana, as noted by AgWeb and Farm Progress.

Policy shifts dominate headlines: HHS Secretary Robert F. Kennedy Jr. canceled $766 million in Moderna funding for mRNA bird flu vaccines, calling off $500 million in related projects amid warnings that vaccines could turn birds into mutant factories, CBS News details. Over 100 federal bird flu tracking scientists, including vaccine and food safety experts, were laid off, alongside FDA veterinary lab cuts, raising alarms as the virus hits dairy herds and drives up egg prices ahead of Easter.

Mexican authorities reported a 3-year-old girl's death from bird flu, while a Canadian ostrich farm lost its Supreme Court battle against culling. Experts urge vigilance, with research probing virus mutations and air monitoring for surges.

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No recent developments on bird flu have emerged in the last 24 hours, either in the US or worldwide, according to available reports from major health agencies like the CDC, WHO, and news outlets such as CNN, Reuters, and The New York Times. The H5N1 strain continues to circulate primarily in wild birds and poultry, with no new human cases or mutations reported since early April 2026.

In the US, the CDC confirms 45 human infections linked to dairy cattle since March 2025, mostly mild among farmworkers in states like California, Colorado, and Michigan, with pasteurization preventing widespread milk contamination. No human-to-human transmission has been detected, though experts monitor genetic changes closely. The USDA reports ongoing culling of infected herds to contain spread, with vaccine trials advancing for livestock.

Globally, the WHO notes over 900 human cases since 2003, mainly in Asia and Africa from direct bird contact, but no pandemic-level shifts. Recent focus remains on vaccination drives in Europe for poultry and enhanced surveillance in Australia after detections in wild birds.

Public health officials urge biosecurity on farms and avoiding sick birds, with no travel advisories or mask mandates needed. Stockpiles of antivirals like Tamiflu remain ready.

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St. Jude Childrens Research Hospital scientists today released the first continent-wide map tracking the dominant D1.1 strain of highly pathogenic H5N1 avian influenza through North American bird populations in 2024. According to lead researcher Richard Webby, the strain entered via Alaska and British Columbia before spreading south and east along migratory pathways, devastating wild birds and poultry since its 2021 arrival on the continent.

The study, published in Nature Medicine, sequenced samples from birds across the US and Canada, revealing the virus remains mostly avian-adapted with no major mutations for efficient human-to-human transmission. Co-author Lisa Kercher noted a mutation conferring resistance to one common antiviral, but existing vaccine candidates showed strong cross-reactivity, indicating current human stockpiles should prove effective.

In the US, the strain poses low risk to the general population in its current form, though surveillance remains critical given severe outcomes in rare human cases. No new US human infections were reported in the last 24 hours.

Globally, CIDRAP reports two new H9N2 avian flu cases on mainland China, alongside a human case in Italy, underscoring ongoing international monitoring.

Researchers stress continued bird flu surveillance to track evolution and protect public health.

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Bird flu outbreaks continue to challenge poultry industries across North America, with fresh detections in the US and a controversial cull in Canada dominating headlines. In Indiana, the USDA's Animal and Plant Health Inspection Service confirmed new H5N1 cases in hard-hit counties, including a duck operation with 4,800 birds and a table egg facility with 91,200 birds in Elkhart County, plus 15,300 ducks in LaGrange County, according to CIDRAP reports. Over the past 30 days, 56 flocks nationwide lost nearly 5 million birds, pushing Pennsylvania's total since 2022 to 16 million, per state officials and USDA data cited in Lebtown.

No new human H5N1 infections were reported to the CDC for the week ending April 4, maintaining zero person-to-person transmission in the US, as detailed in the latest FluView summary. Senator Tammy Baldwin urged the Trump Administration to accelerate a national vaccination strategy for poultry to curb losses exceeding 200 million birds since 2022 and prevent egg price spikes, in a press release from her office.

In Canada, a British Columbia ostrich farm faced a $7 million cull of 314 birds after H5N1 confirmation, sparking protests and an RCMP probe into owners' actions, as investigated by CBC's the fifth estate. The Canadian Food Inspection Agency enforced the stamping-out policy to protect the poultry sector.

Globally, Australian scientists confirmed H5 bird flu in southern elephant seals, fur seals, and gentoo penguins on the remote Heard and McDonald Islands, per Sky News Australia on April 11. California's Año Nuevo State Park reopens this weekend after an H5N1 outbreak killed marine mammals, marking the state's first such detection.

Experts warn wild bird migration could fuel the next wave, with ongoing surveillance critical.

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