“A Pandemic in Slow Motion”: Experts Sound Alarms as Bird Flu Spreads Across All 50 States

As the United States continues to grapple with the aftershocks of COVID-19, a new public health crisis is slowly but ominously gathering force. Leading health experts from the Global Virus Network (GVN) are warning that the country may be on the brink of another devastating pandemic — this time driven by H5N1 bird flu, a virus that has already spread to every U.S. state and killed its first human victim.

The virus, once primarily seen in birds, has now jumped species. Since January 2022, more than 168 million poultry have been culled due to infection. Now, it has infiltrated over 1,000 dairy cow herds and sickened at least 70 people, including a fatal case in Louisiana in January. The deceased was over 65, had prior health conditions, and had come into direct contact with infected backyard birds. A genetic analysis of the virus from their body suggests it had mutated, raising serious alarm bells among virologists.

Although the virus has not yet been shown to transmit between humans, experts warn that could change rapidly through a process known as reassortment — when two different viruses infect the same host and swap genetic material. This, they fear, could unlock the potential for human-to-human transmission.

“This virus might not go pandemic, but it is really trying hard,” wrote virologist Dr. Marc Johnson from the University of Missouri on X (formerly Twitter). “And it sure is getting a lot of opportunities.”

Minnesota is raising the alarm over three avian diseases. The above image shows hazmat-suited workers at a quarantine zone after an outbreak of bird flu in Victoria, Australia

A Mutating Threat

Bird flu has long been a concern in agricultural settings, but its spread into mammals — including cows, pigs, seals, and even foxes — makes it vastly more unpredictable. Pigs, in particular, have alarmed scientists because they can host both bird and human flu strains, creating an ideal “mixing vessel” for a new, potentially dangerous variant.

Wastewater testing across the U.S. shows traces of H5N1 in 60 out of 250 monitored sites. In California and Iowa, over 80% of wastewater samples have tested positive, indicating widespread environmental presence.

More than 12,000 wild and domestic flocks have been infected, and confirmed cases have appeared in 70 people across 14 states — the highest number in decades. In two cases — an adult in Missouri and a child in California — health officials remain unsure how the individuals were infected, suggesting unknown transmission pathways.

Leading health experts are warning that the US could be on the brink of another pandemic, with bird flu now present in all 50 states and millions of poultry culled every week as a result

A Delayed Response

What’s troubling to many experts is how slowly and inconsistently the U.S. has responded. Until late 2024, testing for cattle and exposed farm workers was mostly voluntary. Even today, mandatory testing is limited to cows moving between state lines.

The Biden Administration awarded a $590 million contract to Moderna to develop an H5N1 vaccine, but reports suggest the incoming administration may pull that funding. Meanwhile, the White House Office of Pandemic Preparedness and Response has been left understaffed and underfunded, while pandemic planning has been absorbed into the National Security Council — a move critics say undermines transparency and weakens preparedness.

“This is a pandemic unfolding in slow motion,” said Dr. Ab Osterhaus, an expert in zoonotic viruses and director at the GVN. He and his colleagues are calling for immediate and coordinated action: enhanced surveillance, stronger biosecurity on farms, and public education about safe handling of poultry and dairy products.

The GVN is now calling on world governments to address the threat of H5N1 avian influenza by improving surveillance and implementing biosecurity measures

Lessons from COVID, Warnings for the Future

Experts are sounding the alarm now to avoid the same chaos and confusion that defined the early months of the COVID-19 pandemic. Dr. Peter Palese, a leading influenza researcher and GVN director, said, “We need to ramp up biosecurity and start educating the public now — before it’s too late.”

The U.S. currently holds about 20 million doses of bird flu vaccine in its national stockpile and has the capacity to produce up to 100 million more if needed. Antiviral medications like Tamiflu, used to treat the Louisiana patient, are also available.

Still, concerns remain. The virus has been detected in unpasteurized milk, prompting the USDA to require testing of raw milk samples across dairy operations. Despite its presence in humans, cows, pigs, and wild animals, there’s been no concerted federal plan to contain the virus before it mutates further.

This map shows cases of the virus detected in wild mammals, such as red foxes and seals

Dr. Osterhaus urges a reevaluation of global and domestic disease preparedness: “The current monitoring efforts are simply insufficient. We cannot afford to be reactive. We need proactive, coordinated strategies to prevent the next big one.”

As America marks 25 years since the turn of the millennium — and five years since COVID’s global upheaval — many hoped the era of devastating pandemics was behind us. But with bird flu now entrenched in every corner of the nation, from backyard flocks to commercial farms, from humans to seals, the threat is not only real — it may already be here.

Whether it becomes a global crisis depends not just on the virus, but on how fast and effectively the world chooses to act.