Rachel V Thomas

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US Bird Flu: Can H5N1 Trigger The Next Pandemic?

Avian influenza, or bird flu, is caused by Type A influenza viruses found naturally in wild birds. The virus can spread to poultry and mammals, including dairy cattle. Humans can become infected through contact with infected animals or contaminated environments. While sustained human-to-human transmission of <span>H5N1</span> has not been established, continued outbreaks and the virus's potential to evolve are raising concerns about the risk of a future pandemic, experts warn.

Early this month, a resident of Yakima County in Washington tested positive for avian influenza after exposure to infected dairy cattle, the Yakima Health District and Washington State Department of Health announced. The resident is isolating at home and has not developed severe illness or required hospitalization.

<h2><span rel="noindex">H5N1 In Humans</span>: What Do We Know?</h2>

According to the Pan American Health Organization (PAHO), 1,002 laboratory-confirmed human H5N1 infections and 479 deaths were reported across 25 countries between 2003 and August 7, 2026. In 2026 alone, nine cases, including two deaths, were reported worldwide.

The H5N1 clade 2.3.4.4b circulating among US dairy cattle has been less lethal to humans than some other H5N1 infections. The US has reported at least 72 human cases since the virus spread to dairy cattle, with two deaths. Most patients had contact with infected animals, The Telegraph reportedd.

Symptoms include fever, cough, sore throat, muscle aches and conjunctivitis. Mild infections may resemble COVID-19 or the common cold, potentially leaving cases undetected.

Migrant dairy workers may also avoid voluntary testing over fears of contact with law enforcement.

“If people don’t feel safe coming forward for testing or care, we risk missing early signs of spread, especially in high-risk populations like dairy farm workers,” Dr Krutika Kuppalli, associate professor in the division of infectious diseases at the University of Texas Southwestern, previously told The Telegraph.

<h2>H5N1 Detected In Mink On US Farm</h2>

H5N1 has been detected in at least six captive mink on a Utah farm, according to the US Department of Agriculture (USDA).

Scientists are monitoring the virus in mammals because some species can support viral replication and transmission. Mink are of particular concern because they are susceptible to respiratory viruses, and crowded farms could create conditions for viruses to spread and evolve.

"It is REALLY dangerous to let bird flu spread unchecked through mammals, especially minks, which have similar susceptibility &amp; respiratory physiology to humans. The virus can adapt to human hosts by adapting to the respiratory tract of minks," virologist Dr Angela Rasmussen said, in a post on X.

"We don't know if H5N1 will ever make that evolutionary leap or not. We know that it could. But I hope we don't find out. A worst-case <span>bird flu pandemic</span> could literally kill hundreds of millions of people &amp; cause agricultural, ecological, &amp; economic collapse," she added.

<h2>How H5N1 Spread From Birds To Dairy Cattle</h2>

Marc Johnson, a molecular virologist and professor, shared a timeline of H5N1's spread on X. A new variant spread across the US in early 2022, causing substantial bird mortality and spilling over into several mammal species.

In late 2023 or early 2024, the virus began appearing in dairy cattle's mammary tissue. By the time the outbreak was identified, it had spread to herds across the country.

Johnson said bulk milk testing and strict quarantines could have helped contain the outbreak, warning that the virus continues to circulate among cattle.

"Pasteurization kills H5N1," he said, adding no human cases have been linked to drinking pasteurized milk.

<h2>Could H5N1 Trigger Another Pandemic?</h2>

Scientists are concerned that continued circulation in mammals could allow H5N1 to evolve and become better adapted to mammalian hosts, potentially increasing the risk to humans.

Johnson warned that "continued spread gives the virus more opportunities to evolve". While sustained human-to-human transmission has not been established, a future pandemic remains inevitable.

People who work closely with animals, including agricultural workers, backyard flock owners, hunters and wildlife workers, face a higher risk.

<ul><li>Avoid touching sick or dead animals, wild birds, bird droppings and potentially contaminated surfaces.</li><li>Use appropriate personal protective equipment (PPE) when handling infected animals and report suspected animal infections.</li><li>Wear disposable gloves when handling harvested birds and practice good hygiene.</li><li>Ask a healthcare provider about seasonal flu vaccination. It does not prevent bird flu but may reduce the risk of simultaneous infection with human and avian influenza viruses.</li></ul>

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US Bird Flu

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Avian influenza, or bird flu, is caused by Type A influenza viruses found naturally in wild birds. The virus can spread to poultry and mammals, including dairy cattle. Humans can become infected through contact with infected animals or contaminated environments. While sustained human-to-human transmission of H5N1 has not been established, continued outbreaks and the virus's potential to evolve are raising concerns about the risk of a future pandemic, experts warn.Early this month, a resident of Yakima County in Washington tested positive for avian influenza after exposure to infected dairy cattle, the Yakima Health District and Washington State Department of Health announced. The resident is isolating at home and has not developed severe illness or required hospitalization.H5N1 In Humans: What Do We Know?According to the Pan American Health Organization (PAHO), 1,002 laboratory-confirmed human H5N1 infections and 479 deaths were reported across 25 countries between 2003 and August 7, 2026. In 2026 alone, nine cases, including two deaths, were reported worldwide.The H5N1 clade 2.3.4.4b circulating among US dairy cattle has been less lethal to humans than some other H5N1 infections. The US has reported at least 72 human cases since the virus spread to dairy cattle, with two deaths. Most patients had contact with infected animals, The Telegraph reportedd.Symptoms include fever, cough, sore throat, muscle aches and conjunctivitis. Mild infections may resemble COVID-19 or the common cold, potentially leaving cases undetected.Migrant dairy workers may also avoid voluntary testing over fears of contact with law enforcement.“If people don’t feel safe coming forward for testing or care, we risk missing early signs of spread, especially in high-risk populations like dairy farm workers,” Dr Krutika Kuppalli, associate professor in the division of infectious diseases at the University of Texas Southwestern, previously told The Telegraph.H5N1 Detected In Mink On US FarmH5N1 has been detected in at least six captive mink on a Utah farm, according to the US Department of Agriculture (USDA).Scientists are monitoring the virus in mammals because some species can support viral replication and transmission. Mink are of particular concern because they are susceptible to respiratory viruses, and crowded farms could create conditions for viruses to spread and evolve."It is REALLY dangerous to let bird flu spread unchecked through mammals, especially minks, which have similar susceptibility & respiratory physiology to humans. The virus can adapt to human hosts by adapting to the respiratory tract of minks," virologist Dr Angela Rasmussen said, in a post on X."We don't know if H5N1 will ever make that evolutionary leap or not. We know that it could. But I hope we don't find out. A worst-case bird flu pandemic could literally kill hundreds of millions of people & cause agricultural, ecological, & economic collapse," she added.How H5N1 Spread From Birds To Dairy CattleMarc Johnson, a molecular virologist and professor, shared a timeline of H5N1's spread on X. A new variant spread across the US in early 2022, causing substantial bird mortality and spilling over into several mammal species.In late 2023 or early 2024, the virus began appearing in dairy cattle's mammary tissue. By the time the outbreak was identified, it had spread to herds across the country.Johnson said bulk milk testing and strict quarantines could have helped contain the outbreak, warning that the virus continues to circulate among cattle."Pasteurization kills H5N1," he said, adding no human cases have been linked to drinking pasteurized milk.Could H5N1 Trigger Another Pandemic?Scientists are concerned that continued circulation in mammals could allow H5N1 to evolve and become better adapted to mammalian hosts, potentially increasing the risk to humans.Johnson warned that "continued spread gives the virus more opportunities to evolve". While sustained human-to-human transmission has not been established, a future pandemic remains inevitable.How Can You Reduce Your Risk?People who work closely with animals, including agricultural workers, backyard flock owners, hunters and wildlife workers, face a higher risk.Avoid touching sick or dead animals, wild birds, bird droppings and potentially contaminated surfaces.Use appropriate personal protective equipment (PPE) when handling infected animals and report suspected animal infections.Wear disposable gloves when handling harvested birds and practice good hygiene.Ask a healthcare provider about seasonal flu vaccination. It does not prevent bird flu but may reduce the risk of simultaneous infection with human and avian influenza viruses.

us bird flu: can h5n1 trigger the next pandemic?

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US Bird Flu: Can H5N1 Trigger The Next Pandemic?

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