H5N1, otherwise known as Bird Flu, has spread across the world in 30 years, but it may be entering a deadly new era.By Darren OrfPublished: Nov 10, 2026 9:00 AM ESTSave ArticleShare ArticleListen (5 min)

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Earlier this week, a resident in Yakima County in Washington State died from bird flu, a highly pathogenic avian influenza (HPAI) virus. Known in more scientific circles as the H5N1, the virus isn’t nearly as threatening to humans as the Covid-19 coronavirus (whose first victims were similarly located in Washington State back in February 2020). But some experts are growing increasingly concerned that this influenza, which for decades has decimated avian populations (and in more recent years, severely impacted the dairy industry), could develop into something more sinister.

The first known case of H5N1 first appeared in 1996 in flocks of domestic waterfowl in southern China. By its nature as an HPAI virus, H5N1 is tailored to latch on to avian cells rather than mammalian cells, including a human’s. However, things have slowly been changing over the decades, and H5N1 mutations have made the virus much more adept at attacking mammals.

The newest threat originated during the depths of the Covid-19 pandemic as H5N1 wreaked havoc on seabirds in Europe. The virus eventually found its way to the U.S. in 2022, and hundreds of millions of birds, both wild and domestic, died as a result. A 2024 study by UC Davis reported that the virus reached the very tip of South America, infecting and killing thousands of elephant seals and leaving their bodies strewn along Argentinian beaches.

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Of course, elephant seals are famously not birds, and during that same time, bovine populations in the U.S. started exhibiting signs of H5N1 infections, driven by polymerase mutations that allowed for better replication in bovine cells. Concerningly, a 2024 study demonstrated that just a single mutation to the bovine influenza H5N1, specifically the hemagglutinin (the surface protein that drives attachment), could switch the virus’s specificity to target humans.

Intermediate species can help the virus make the jump to humans (one theory suggests that this is how Covid-19 spread from bats to humans), and last month ProPublica reported that a recent outbreak of H5N1 at a mink farm in Utah is particularly distressing. Unlike those of cows or elephant seals, mink lungs and airways closely resemble ours at a cellular level, raising fears that the virus could adapt to infect humans more easily. When H5N1 impacted mink and fox farms in Finland and Spain, officials moved to cull the infected populations, killing tens of thousands of animals in the process. But ProPublica says state and federal officials in the U.S. have instead done little to curtail the spread.

“Every other country that I’m aware of that has had H5N1 in fur farms, depopulation has happened pretty quickly,” avian influenza researcher Tom Peacock told ProPublica. “The fact that the first instinct wasn’t just to depopulate and figure stuff out later is very concerning to me.”

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If the worst comes to pass, the Trump Administration has gone out of its way so that the country—and the rest of the world—will be vulnerable to the virus. In May 2025, Robert F. Kennedy, the U.S. Secretary of Health of Human Service and well-known vaccine skeptic, cancelled a $700 million contract with Moderna to develop an mRNA vaccine for H5N1.

The tragic death earlier this month came from the H5N1 B.13 genotype variant seen in cows, and a CDC spokesperson speaking with Associated Press said that the virus contained no changes that would make it more contagious—but the threat very much remains.

“A bad scenario would be that someone working with cattle brought the ‘regular’ human flu in, got [H5N1] on top of that, and that develops into a mix that can spread but to which people have less immunity,” public health virologist Marion Koopmans told The Telegraph. “The chances of such an event are very low, but it is a concern shared among virologists.”