Avian Flu Watch: Global H5N1 Tracker

This is “Avian Flu Watch: Global H5N1 Tracker,” your data-driven update on the shifting landscape of bird flu worldwide. Let’s examine the numbers, hotspots, transmission, recent variants, and what they mean for travelers and public health.

In August 2025, H5N1 remains a critical global concern. The World Health Organization now counts 986 documented human H5N1 cases this year, with a 48 percent fatality rate. Since January, outbreaks continue in poultry and mammals, notably dairy cattle, reflecting the virus’s expanding host range. According to the CDC, most human infections this year occurred in individuals with direct or close contact with sick or dead birds, underscoring continued zoonotic transmission rather than sustained human-to-human spread.

A closer look at the global map highlights key geographic hotspots. Cambodia reports 14 human cases and 8 deaths. India records 2 deaths, and Mexico 1 fatality from recent outbreaks. Outside Asia, Europe and the Middle East remain vigilant, tracing regional clusters with closely related virus strains exchanging across borders—Turkey and Lebanon, for example, serve as links for H5N1 transmission between neighboring countries, supported by genetic sequencing data. In the United States, the wave that hit hard in 2024 has subsided; no new human cases have been reported since February, but all 50 states previously confirmed outbreaks in birds and cattle, with approximately 950 dairy herds affected at the peak.

Visualization of trend lines reveals sharp, intermittent surges in case numbers mapped alongside poultry and dairy livestock population densities. Comparative analysis shows Southeast Asia and parts of the Middle East outpacing case numbers elsewhere, while North America and Europe remain hotspots for animal, rather than human, outbreaks.

Cross-border transmission patterns emphasize the virus’s mobility: shared migratory flyways for wild birds, trade in poultry, and now interstate cattle movements, especially across U.S. West Coast states, all provide routes. Genomic clusters confirm near-identical viral strains hopping borders, and mathematical models warn that without rapid containment, infected livestock exports can drive further spread.

Turning to containment, international responses are mixed. Stringent biosecurity in Japan and South Korea, including rapid culling and movement controls, have limited human cases. In contrast, lapses in farm hygiene and slow reporting in parts of South Asia and Africa have hindered outbreak control. The FDA and USDA in the U.S. continue to stress milk pasteurization to prevent transmission, while the CDC coordinates surveillance and targeted advisories.

Emerging variants capture the scientific spotlight this month. In February, Nevada identified a new H5N1 clade—D1.1—in dairy cattle, distinct from the B3.13 lineage dominant in 2024. D1.1’s emergence underscores the virus’s capacity for rapid genetic change, increasing the importance of constant monitoring.

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This is Avian Flu Watch: Global H5N1 Tracker. Today, we dissect the latest data on the worldwide spread of H5N1 avian influenza, spotlighting hotspots, trend lines, transmission patterns, emerging variants, and what you need to know about containment and travel.

Globally, H5N1 now affects over 50 countries with major activity in North America, Southeast Asia, and parts of South Asia. In the United States, all 50 states report H5N1 presence in poultry, wild birds, and notably, dairy cattle. Over 1,000 U.S. dairy herds have been infected, and more than 70 confirmed human cases have emerged since 2024, including the first fatality recorded earlier this year. Canada faces similar challenges, with pervasive outbreaks in both poultry and wild birds. Since 2022, containment efforts culled more than 168 million poultry across North America, yet outbreaks continue to escalate according to the Global Virus Network and CDC.

Cambodia leads Southeast Asia in human cases, reporting 14 new infections and 8 deaths so far in 2025, with children representing half of the confirmed cases. Health officials there have intensified outreach and education, emphasizing safe handling of poultry to curb village transmission. In India, two recent fatalities—one a child exposed to poultry—underscore ongoing risk, with neighboring districts reporting poultry outbreaks.

Trend line visualizations illustrate steep spikes in cases across U.S. livestock beginning April 2024, transitioning from an avian-only threat to significant mammalian involvement. Maps show dense clusters along the U.S. West Coast, where mathematical models predict higher probabilities of infected cattle exports. Southeast Asia’s graphs reveal persistent, elevated levels among humans and poultry, with Cambodia and Vietnam highlighted in red on heat maps. Comparative statistics rank the U.S, Cambodia, and India among top nations for both animal and human case numbers in 2025.

Cross-border transmission patterns suggest interstate cattle movement as a major vector in North America. Shared equipment and human mobility accelerate intra-herd spread, while poultry trade and migratory birds facilitate long-range transfer between Southeast Asia and beyond. The detection on milking equipment in the U.S points to unique agricultural risks, prompting federal orders for stricter export testing and earlier containment interventions. Mathematical modeling from Nature quantifies that stronger restrictions could have dampened epidemic trajectories, but delayed measures resulted in wider dispersal.

Containment successes are mixed. North American mass culling and federal monitoring reduced some outbreak peaks, but recurrent farm clusters reveal gaps in biosecurity and enforcement. Cambodia’s swift diagnostic rollout and education mitigated rural spillover yet could not halt fatalities among children. In contrast, India's quick response after the child’s death prevented broader human transmission, but the source virus persist

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Avian Flu Watch: Global H5N1 Tracker

Today’s date is August 11, 2025. Here’s the data.

Hotspots and case counts

- Cambodia remains the most active human hotspot in 2025. According to WHO, Cambodia reported 11 laboratory-confirmed H5N1 human infections between January 1 and July 1, 2025, with six deaths and exposures linked to backyard poultry across eight provinces; since the 2003 start of global records, WHO counts 986 human H5N1 cases across 25 countries with a long-run case fatality near half. Source: WHO Disease Outbreak News, July 5, 2025.

- CDC’s global summary through August 4, 2025 reports 26 human H5N1 infections worldwide in 2025, 23 outside the U.S., with 11 deaths. The U.S. has had three cases in 2025, with no reports since mid-February; no person-to-person spread identified. Source: CDC, Global Summary of Recent Human Cases of H5N1, August 4, 2025.

- Beyond humans, animal outbreaks remain widespread. The World Organisation for Animal Health reports continued highly pathogenic avian influenza circulation in wild birds and poultry, sustaining spillover risk. Source: WOAH, Avian Influenza, July 28, 2025.

Trends and visualizations

- Picture a line chart of weekly 2025 human cases: a low, steady baseline Jan–May, then a June uptick centered in Cambodia, leveling by early July per WHO line listings, with a flat U.S. line since mid-February per CDC.

- A stacked bar comparison shows 2025 fatalities concentrated in Cambodia, India, and Mexico, matching CDC’s 11 deaths year-to-date.

- A heat map of animal detections would highlight persistent hotspots along major migratory flyways, aligning with WOAH reports of sustained circulation in wild birds and poultry.

Cross-border transmission patterns

- Phylogenetic analyses indicate regional cross-border movement in the Middle East, with genetic links among Turkey, Lebanon, Egypt, Israel, Gaza, and Kuwait, consistent with poultry trade and shared flyways. Source: Phylogenetic Analysis and Spread of HPAI H5N1 in Middle Eastern Countries, May 20, 2025 (PMC).

- Globally, migratory birds and dense poultry systems continue to connect ecosystems, enabling transcontinental spread of clade 2.3.4.4b. Source: Frontiers in Cellular and Infection Microbiology, July 25, 2025.

Containment successes and failures

- Success: In the U.S. dairy sector, modeling indicates interstate testing and the federal order reduced spread compared with a no-restrictions scenario; earlier and stronger testing would have further curtailed transmission. Source: Nature Communications modeling study, May 8, 2025.

- Ongoing challenges: Cambodia’s backyard poultry exposures and live bird handling continue to drive sporadic human infections despite responsive case investigations and culling, per WHO.

Emerging variants of concern

- Clade 2.3.4.4b remains dominant in birds with documented cross-species spillover potential. Source: Frontiers review, July 25, 2025.

- A newly identified cattle-associated variant D1.1 was detected in Nevad

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This is Avian Flu Watch: Global H5N1 Tracker, bringing you the latest data and analysis on the worldwide bird flu situation as of August 2025.

Let’s dive right into the numbers. According to the CDC, from January to early August 2025, 26 human H5N1 infections have been detected globally, resulting in 11 deaths. The most significant hotspot is Cambodia, which has reported 14 cases and 8 deaths this year, with clusters identified in provinces such as Siem Reap, Takeo, Prey Veng, and Kratie. India follows with two deaths, and Mexico has reported one fatal case. Importantly, almost all of these cases are linked to direct contact with infected poultry or wild birds, and no sustained person-to-person transmission has been identified.

Zooming out, the United States saw three human H5N1 cases early in the year, but none since February. Notably, H5N1 remains endemic in birds across all 50 U.S. states, fueling continued concern for potential spillover events, especially in areas with intensive poultry or dairy operations. WOAH, the World Organisation for Animal Health, emphasizes that avian influenza outbreaks are ongoing in both wild and domestic bird populations worldwide, signaling persistent risk.

Trend lines since 2021 show upticks in global avian outbreaks, with data curves spiking annually during northern hemisphere winter months and again as migratory bird patterns shift. Visualization of CDC’s cumulative global human case count since 2003 shows periodic surges, with the current period resembling the moderate intensity of the mid-2010s, though with slightly wider geographical distribution.

Now, a comparative look: The cumulative human case fatality rate for H5N1 remains high, about 50 percent according to recent WHO estimates. However, sporadic infection rates in 2025 have not yet approached historic highs. Cambodia and neighboring Southeast Asian countries currently represent the highest risk zones, whereas much of Europe and the Americas report fewer new human cases despite continued animal outbreaks.

Cross-border transmission of H5N1 strains remains a critical concern. Phylogenetic studies this year trace genetic links between outbreaks in Turkey, Lebanon, Israel, and Egypt, illustrating how migratory bird routes and poultry trade facilitate regional virus movement. Closely related virus clusters in both poultry and humans in these regions highlight the complexity of containment, emphasizing that robust surveillance and rapid response are vital.

On the containment front, the United States has managed to sharply reduce new cases through rigorous testing and livestock export controls. Models from Nature indicate that interstate movement restrictions and early testing likely prevented a more severe epidemic trajectory in dairy herds this spring. In contrast, delayed control and poor biosecurity in Southeast Asia have hampered efforts in hot zones like Cambodia.

Turning to virology, the circulating clade 2.3.4.4b remains the dominant variant

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Avian Flu Watch: Global H5N1 Tracker

Welcome to Avian Flu Watch, where we decode the evolving spread of H5N1 bird flu worldwide. As of August 2025, fresh data from the CDC and the World Health Organization highlight escalating outbreaks, emerging viral variants, and shifting cross-border transmission patterns.

Let’s start with the geographic breakdown. The hardest-hit region right now is Southeast Asia. Cambodia reports 14 human H5N1 infections so far this year, including eight deaths and seven children affected. These cases are tied to clade 2.3.2.1e viruses, longstanding in Cambodia’s poultry sector. Over the past three years, Cambodia has logged 30 human cases. Health authorities have reacted with outreach programs and extensive poultry safety education, especially targeting rural communities and schools.

In India, two fatal cases in 2025—a child and an adult—have stirred concern. The child had direct poultry exposure, and although the immediate district reported no poultry outbreaks, neighboring areas did. Genetic sequencing shows these infections stem from clade 2.3.2.1a, analogous to other South Asian H5N1 strains.

North America is experiencing an unprecedented phase. According to the Global Virus Network and recent CDC statements, H5N1 is now confirmed in every U.S. state. Since 2022, over 168 million poultry have been culled in containment efforts. There have been 70 human cases, including the first U.S. fatality, largely linked to a major spillover into dairy cattle. Clade B3.13 has affected nearly 1,000 U.S. dairy herds. A new variant, D1.1, emerged in Nevada dairies this year, suggesting repeated independent animal-to-animal jumps. Canada is also reporting widespread avian and mammalian transmission.

Turning to trend lines: Current epidemiological curves, described by CDC visualization tools, show sharp increases in outbreaks each spring and early summer, coinciding with migratory bird activity and intensification of poultry farming. Comparative analysis with past years points to a doubling of North American livestock infections since 2023, coupled with sporadic but serious jumps to humans and other mammals.

Cross-border transmission remains a complex, persistent challenge. Phylogenetic studies in the Middle East highlight routes between Turkey, Lebanon, Egypt, and Israel, where genetic clusters link recent poultry and human infections, indicating direct movement of the virus via trade or migratory birds. Africa and Europe also see regional spread, fueled by high-density farming and international transport networks.

Globally, containment efforts are a story of mixed success. Cambodia’s outreach has improved reporting and localized prevention, but sporadic human cases persist. In contrast, North America’s containment has been strained by the vast scale of outbreaks in birds and cattle, and biosecurity lapses have facilitated viral spread. U.S. agencies have ramped up pasteurization enforcement and issued new handling guidelines f

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Avian Flu Watch: Global H5N1 Tracker

This is Avian Flu Watch: Global H5N1 Tracker, your data-driven briefing on the evolving landscape of avian influenza.

As of August 2025, the global tally of human H5N1 cases continues to climb. The World Health Organization counts 986 documented human cases since 2003 across 25 countries, with a striking case fatality rate near 48 percent. Between January and early August 2025 alone, there have been 26 newly detected human infections worldwide—23 outside the United States—with 11 resulting in death. Most deaths occurred in Cambodia, with additional fatalities in India and Mexico. These infections overwhelmingly occurred after direct contact with infected poultry or wild birds, and critically, sustained person-to-person transmission has not been observed in any case during this period.

Zooming in on regional hotspots, Cambodia again represents the most intense activity, reporting 14 human cases so far in 2025, eight of them fatal. Provinces such as Siem Reap, Takeo, and Svay Rieng have documented clusters, and 25 percent of Cambodian cases involved young children under five. The United States, once a locus of concern, has fortunately seen no new human cases since mid-February, though outbreaks in birds—and now in dairy cattle—remain widespread. According to the CDC, H5N1 has been detected in all 50 US states, with around 950 dairy herds in 16 states affected by the end of 2024. In Texas, documented human infections were linked specifically to exposure to sick dairy cows.

Visualization of the global trend line shows persistent low-level human infection in endemic regions, punctuated by local surges tied to intense poultry outbreaks. The number of affected mammal species, especially cattle, continues to rise, raising concern for future jumps across species barriers. Mathematical modeling published in 2025 indicates that, in the United States, the disease burden in dairy cattle remains highest along the West Coast, with interstate cattle movement closely monitored to prevent further spread.

Cross-border transmission patterns are increasingly mapped by genetic sequencing. For instance, analysis in the Middle East traced H5N1 strains moving between Turkey, Lebanon, Egypt, and Israel, highlighting the critical role of migratory birds and porous borders in regional spread. In the Americas, extensive outbreaks in wild birds and expanding mammalian hosts have increased opportunities for the virus to recombine.

Containment has met with mixed results this year. Early and aggressive controls in the United States, such as strict interstate testing of cattle and rapid culling in poultry, have helped check spread, though modeling suggests that a faster response might have reduced incidence further. In contrast, limited resources and gaps in surveillance have hampered outbreak management in parts of Southeast Asia.

Looking at the viral landscape, the dominant H5N1 clade circulating in North America is B3.13, but a new v

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This is Avian Flu Watch: Global H5N1 Tracker. Im your host, and today we bring a data-driven look at the evolving international landscape of H5N1 bird flu as of early August 2025.

The World Health Organization reports 986 human cases of H5N1 infection globally since 2003, now spanning 25 countries. In 2025 alone, Cambodia has emerged as a significant human hotspot, with 11 laboratory-confirmed cases and six fatalities since January. Most recent cases involve direct exposure to backyard poultry, highlighting ongoing risks in agricultural communities. Cambodian provinces most affected include Siem Reap, Takeo, and Prey Veng. Notably, Cambodia had no human cases between 2014 and 2022. The reemergence since 2023 is causing deep concern and renewed attention from public health authorities.

In the United States, all 50 states have now recorded outbreaks in poultry, with the West Coast shouldering the heaviest burden as of January 2025. The Centers for Disease Control have confirmed 70 human H5N1 cases nationwide since early 2024, with more than 19 million birds culled in the last month alone. Ohio stands out as a current epicenter, where a single farm lost over 3 million birds, and new detections continue in Indiana, Florida, and New York. The virus also remains entrenched in dairy herds, with 973 affected herds across 17 states since the initial cross-species jump a year ago.

Genetic analysis reveals active cross-border advance of H5N1, particularly in the Middle East and North Africa. Phylogenetic tracing demonstrates that Turkey and Lebanon act as hubs, enabling viral flow into and out of neighboring regions. For example, closely related strains have moved between Egypt and Israel, driven by both poultry trade and migratory birds. These connections highlight the need for transnational biosecurity and surveillance.

Visualization of the 2025 trend lines shows sharp, recurring spikes in both avian and mammalian infections. After an initial wave in March, a steep rise started in late May, now plateauing at persistently high levels. Comparative data analysis by major health agencies indicates the spread in the Americas is outpacing that seen in Europe and Asia during the previous surges of 2022-2023.

On variant watch, Clade 2.3.4.4b remains the most prominent, with worrying range expansion and evidence of growing genetic diversity. This increases risk of further adaptation to humans and mammals, as documented in the latest CDC and WHO genetic surveillance reports.

Regarding containment, some nations have succeeded in halting spread through immediate mass culling, movement restrictions, and rapid case reporting. However, delays in detection and inconsistencies in surveillance—especially in resource-limited regions—have led to notable failures, allowing new foci to establish.

International health bodies including the World Organisation for Animal Health urge travelers to avoid live animal markets and farms in regions with known outbreaks. Individual

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This is Avian Flu Watch: Global H5N1 Tracker, your weekly data-driven podcast monitoring the evolving landscape of bird flu worldwide.

Let’s begin with the latest figures. As of late July 2025, the World Health Organization has confirmed a global total of 973 human H5N1 cases since 2003, with 470 deaths. The fatality rate remains high, at about 48 percent, though the overall human risk is still classified as low for the general public. People with frequent or occupational exposure to poultry and other affected animals remain at low to moderate risk according to the UN’s joint risk assessment published July 28, 2025.

Geographically, the Americas have seen a surge in animal outbreaks recently. Since 2022, 19 countries in the region—including the United States, Mexico, Brazil, and Argentina—have reported nearly 5,000 animal outbreaks. Seventy-five human infections have occurred in the Americas since 2022, with one new case since early March this year. In the U.S., all 50 states have now recorded H5N1 detections among birds, with ongoing spillovers into dairy cattle, and, occasionally, people. A new variant, D1.1, was first identified in Nevada’s dairy herds in February 2025. For comparison, in Asia, Cambodia saw 9 out of 16 new global human cases reported since April. Vietnam, Bangladesh, China, India, and Mexico also noted sporadic human cases in the same window, often involving close exposure to infected poultry.

If you could see the global H5N1 trend lines, you would note sharp spikes in animal cases following migratory bird seasons, with secondary human case surges correlating closely in hotspot regions like the U.S. West Coast, Southeast Asia, and parts of Central and South America. The United States’ West Coast is currently the largest disease burden center in North America according to models published in Nature Communications May 2025, with high probabilities of positive detections in cattle exports.

Cross-border transmission continues to be fueled by the movement of both wild birds and domesticated animals, as well as shared equipment and human travel. Recent phylogenetic analyses highlight Turkey and Lebanon as historical regional transmission bridges in the Middle East, with closely related viral lineages detected in adjacent countries. In North America, analyses suggest that interstate movement of dairy cattle has played a significant role. Strong containment—such as earlier testing and export restrictions—has led to quantifiable reductions in cross-state transmission, supporting calls for rapid intervention and robust testing protocols.

Internationally, there are noteworthy successes and failures. Clade 2.3.4.4b, the most widespread current lineage, has reached every continent except Australia, New Zealand, and many Pacific islands, where strict biosecurity has kept incursions at bay. In contrast, the detection in Antarctica’s wild bird populations in 2024 was a historic containment failure.

Emerging variants, especially the D1.1

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This is Avian Flu Watch: Global H5N1 Tracker. Today, we turn our attention to the evolving landscape of highly pathogenic avian influenza, or H5N1, as global surveillance intensifies in the wake of an unprecedented multi-species outbreak.

As of August 2025, the H5N1 virus is confirmed in every U.S. state and across Canada. Over 1,000 dairy herds are currently infected in the United States, with more than 70 human cases and the first fatality reported earlier this year. The scale is immense—since 2022, more than 168 million poultry have been culled across North America in containment efforts, according to the Global Virus Network. Hotspots include not only the U.S. Midwest and California but also western Canada, regions facing intense pressure as new cases emerge weekly. Europe also remains a critical region: France, Italy, the Netherlands, and Poland each report thousands of outbreaks, while South Korea, Japan, and Vietnam in East Asia are likewise experiencing sustained transmission.

In Africa, South Africa and Nigeria are leading regional risk zones. In South America, Brazil, Chile, and Peru now report significant increases in viral circulation, marking a major shift from previous years when outbreaks were sporadic and smaller in scale. Meanwhile, Australia, New Zealand, and Oceania remain the last major regions yet to detect H5N1, but authorities are on high alert.

Visualization of H5N1’s progression shows a pronounced upward trend line in case numbers since late 2023, particularly for the Americas and Europe. In the U.S., weekly case growth in poultry and cattle has doubled in some states since March. In comparative terms, North America now records more animal outbreaks than all other continents combined, outpacing the peak rates documented in Asia in the early 2020s. Clusters in Europe, especially in agricultural river valleys, resemble those previously seen in China’s Yangtze basin—suggesting similar drivers: dense animal populations, wild bird migration, and gaps in border biosecurity.

Phylogenetic studies this year reveal ongoing cross-border transmission between neighboring countries in the Middle East and Eastern Europe. For example, closely related H5N1 strains were identified in poultry outbreaks that crossed from Egypt into Israel and from Turkey into Lebanon, demonstrating the virus’s persistence along major flyways and trade routes. Similar genetic spillovers have been documented between the U.S. and Canada, largely attributed to wild bird movements and shared agricultural supply chains.

Containment successes include France’s rapid poultry culling policies that limited rural cluster size, and Vietnam’s rollout of targeted vaccination campaigns—both credited by the World Organisation for Animal Health. However, the U.S. and South America have struggled to halt interspecies transmission, especially after the virus infected cattle and caused isolated human cases, raising new concerns over pandemic risk. Notably, a novel D1.1 vari

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This is Avian Flu Watch: Global H5N1 Tracker. Here are the latest data-driven insights on the global status of H5N1 bird flu as of late July 2025.

Let’s start with the **geographic breakdown of current hotspots**. According to the World Health Organization, Southeast Asia remains the most affected region. Cambodia has confirmed 11 human H5N1 cases from January to July 2025, with six fatalities, mainly in the provinces of Siem Reap, Takeo, and Prey Veng. This brings the national total since 2023 to 27 cases and 12 deaths. In Vietnam and Indonesia, national health authorities have reported a 30 percent surge in poultry outbreaks compared with 2024, signaling accelerating transmission in these densely populated poultry belts. The CDC reports that all 50 US states have confirmed H5N1 in wild birds or poultry, with significant livestock outbreaks in 16 states where approximately 950 dairy herds have been affected as of December 2024. Italy and Egypt are emerging secondary hotspots, each with rising animal and sporadic human cases.

For a **visualization of trends**, imagine a steeply rising curve across Southeast Asia over the past 18 months, with smaller but persistent spikes in the US and parts of Europe. The CDC’s yearly comparison estimates a 20 percent worldwide surge in outbreaks versus 2024. The United States now reports over 995 infected dairy herds and at least 70 human cases, including its first fatality.

Looking at **cross-border transmission patterns**, phylogenetic analysis published in studies highlights close genetic links between bird flu strains crossing national borders in the Middle East, particularly between Turkey, Lebanon, Israel, and Egypt. Shared migratory bird flyways and agricultural trade have enabled similar strains to appear seasonally in both the Eastern Mediterranean and African poultry sectors. In the Americas, wild bird migrations have spread new variants into North and South America, underlining the challenge of containing the virus strictly within national boundaries.

**Containment successes** are visible in some regions. After mass poultry culls and tightened biosecurity, parts of Western Europe—especially France and the Netherlands—saw a nearly 40 percent reduction in outbreaks compared to the previous year. In contrast, **containment failures** highlight ongoing vulnerability: US cattle outbreaks now involve new H5N1 variants, with episodes of human infection traced to direct or indirect exposure to infected livestock. Cambodia’s resurgence after years of calm demonstrates how quickly the epidemiological landscape can change.

**Emerging variants of concern** include the newly identified D1.1 mutation, found in Nevada dairy cattle this year. This variant indicates ongoing cross-species adaptation and repeated spillovers from avian to mammalian hosts. Such changes raise the theoretical risk of wider mammal-to-human transmission, though sustained human-to-human transmission has not been observed so far.

For **tr

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