The virus concentrates in cow udders, making raw milk a direct pathway
As H5N1 bird flu quietly advances through American dairy herds, federal health officials find themselves at the edge of their authority — able to warn, but not to prohibit. The FDA's open letter to state governments is less a command than a plea, asking states to use the regulatory power the federal government does not possess to restrict raw milk sales where infected herds have been confirmed. In the space between what is known and what remains uncertain, three dairy workers have already been infected and farm animals have died, reminding us that the boundaries between human, livestock, and viral life are more porous than we tend to assume.
- H5N1 has now reached 82 dairy operations across 10 states, with Minnesota the latest to confirm infected cattle — and the outbreak shows no sign of slowing.
- The virus concentrates in cow udders, turning raw milk into a potential transmission vector, yet whether drinking it can infect humans remains an open and urgent question.
- Three dairy workers have already contracted H5N1 through raw milk exposure, and farm cats that drank unpasteurized milk from sick cows have died — the human and animal cost is already real.
- The FDA lacks the authority to ban raw milk sales across state lines, leaving it to urge states to act — a patchwork of laws means some states prohibit raw milk entirely while others sell it labeled as pet food.
- The agency is calling for stronger public warnings, herd surveillance testing, monitoring of cattle for infection signs, and heat treatment of any raw milk fed to animals — while promising new research on the virus's behavior in raw milk products.
The H5N1 bird flu virus is spreading through American dairy herds, and federal health officials are now pressing states to act. On Thursday, the FDA sent an open letter to state governments urging stronger public warnings and testing of herds that produce raw milk for human consumption. Minnesota became the tenth state to report infected cattle, bringing the national total to 82 confirmed dairy operations.
The FDA cannot ban raw milk sales within state borders — that authority rests with individual states, whose laws vary widely. Some prohibit raw milk entirely; others allow it, with a few permitting sales only when labeled as pet food. The agency can only urge states to restrict sales in areas where herds have tested positive.
The virus appears to concentrate in cow udders, making raw milk a direct pathway for potential transmission. Three dairy workers who handled raw milk have already been infected with H5N1, and on farms, cats that consumed unpasteurized milk from sick cows have died. Whether humans can contract bird flu by drinking contaminated milk remains unknown, but the FDA's acting food safety director framed the concern as one that spans species — human, livestock, and wildlife alike.
The agency is asking states to implement surveillance testing, monitor cattle for signs of infection, issue stronger consumer warnings, and ensure safe disposal of milk from sick animals. Raw milk fed to calves or other animals should be pasteurized. The FDA also said it would soon release new research on how H5N1 behaves in raw milk products. For now, it is working at the limits of its authority, and the question is whether states will move quickly enough as the virus continues to spread.
The H5N1 bird flu virus is moving through American dairy herds, and federal health officials are now pushing back against the sale of raw milk. On Thursday, the Food and Drug Administration sent an open letter to state governments asking them to take stronger action—warning their citizens more forcefully about raw milk's dangers and testing the herds that produce it for human consumption.
The scope of the outbreak is widening. Minnesota became the tenth state to report infected cattle this week. Across the country, 82 dairy operations have tested positive for the virus, according to the US Department of Agriculture. The FDA cannot ban raw milk sales within state borders—that authority belongs to individual states—but it can urge them to use their regulatory power to restrict sales in areas where herds have been infected. Some states already prohibit raw milk sales entirely. Others allow it, though a few permit it only when labeled as pet food, a legal fiction that acknowledges what happens in people's kitchens.
The virus appears to concentrate in cow udders, making raw milk a direct pathway for transmission. Whether humans can actually contract bird flu by drinking contaminated milk remains unknown. But the evidence is troubling enough. Three dairy workers who handled raw milk have already been infected with H5N1. On farms, cats that consumed unpasteurized milk from sick cows have died. The FDA's acting director of food safety, Dr. Don Prater, framed the request as a matter of protecting public health across species—humans, livestock, and wildlife alike.
Beyond bird flu, raw milk carries other documented risks. The FDA lists illness, miscarriage, stillbirth, kidney failure, and death as potential consequences of consumption. The agency is now asking states to implement several measures: stronger public warnings, surveillance testing of dairy herds that produce raw milk for sale, monitoring of cattle for signs of infection, and safe disposal of milk from sick animals. Any raw milk fed to calves or other animals should be heat-treated or pasteurized.
The FDA said it would soon release new research and data on how the H5N1 virus behaves in raw milk and raw milk products. For now, the agency is working within the limits of its authority, relying on states to act. The question is whether states will move quickly enough as the virus spreads.
Citas Notables
Given the current and potential future risks that HPAI H5N1 virus poses to our nation's public health, it is important to work together to minimize the additional exposure of humans and other animal species.— Dr. Don Prater, acting director of the FDA's Center for Food Safety and Applied Nutrition
La Conversación del Hearth Otra perspectiva de la historia
Why is raw milk such a particular problem for this virus? Why not pasteurized milk?
The virus seems to concentrate in the udders of infected cows. Raw milk captures it at high levels. Pasteurization kills it. So raw milk is essentially a direct vector from cow to human.
But we don't know yet if people actually get sick from drinking it?
Right. We know three dairy workers who handled raw milk got infected. We know farm cats died from it. But whether someone drinking a glass of raw milk would get bird flu—that's still an open question.
That sounds like a reason to be cautious.
It is. The FDA is essentially saying: we don't know how bad this could be, so let's not find out the hard way. Test the herds, warn people, restrict sales where we know there's infection.
Can the FDA actually ban raw milk?
Not within states. That's a state power. The FDA can only ban interstate sales. So the agency is asking states to use their own authority to restrict it.
And are states doing that?
Some have. Others allow it with varying rules. A few states even allow it labeled as pet food, which is a way of saying: we know people will drink it anyway, so we're not going to pretend otherwise.
How many herds are infected now?
Eighty-two across ten states. Minnesota just became the tenth. It's spreading.