The U.S. isn't ready for another pandemic, but it could happen anyway. As bird flu spreads, the threat grows.

Bird flu, or H5N1, kills between 90% and 100% of infected
chickens, normally within 48 hours. (Adobe Stock photo)

Whether it's high egg prices or the fear of another pandemic, many Americans want bird flu, also known as avian flu, contained and a long-term answer found. Secretary of Health and Human Services Robert F. Kennedy Jr., however, "recently mused about a novel way to contain bird flu, which is to let it 'run through the flock so that we can identify the birds, and preserve the birds, that are immune to it,'" reports Hanna Rosin of The Atlantic. "This could involve millions of birds dying slower, more horrible deaths."

While studying birds -- not necessarily chickens -- that are immune to bird flu is important work that could help breed more resilient flocks, many scientists would not recommend letting bird flu "run through" flocks "because it would only give the H5N1 virus that causes bird flu more opportunities to evolve, which it’s already doing at what experts see as an alarming rate," Rosin explains. "So far, the outbreak has caused one human death in the United States and several others overseas."

Looking back, the U.S. government had a brief window to act and contain the virus in the spring of 2024, when bird flu surfaced in a small number of dairy cows. Science reporter Dr. Katie Wu explained to Rosin how the virus spread: "Instead, they let business proceed as usual and dairy cattle move all over the place throughout their lifetime. They gave the virus more opportunities to spread. That should have been a five-alarm-fire level of: We need to ratchet up this response and make sure that the virus does not move any further than it already has. And that did not happen."

Will the virus reach a tipping point from a growing concern to a full-blown epidemic? That point is uncertain and perhaps there are more important concerns. Wu told Rosin, "I think the right question to be asking is: How prepared would we be if this truly escalated to that point? And the answer is: not at all. Like, not even a little bit. It’s impossible to say with any kind of certainty, Oh, there’s exactly, you know, a 14.7 percent chance this is going to turn into a pandemic. . . .We can’t know those things. A lot of this is about randomness, about how we continue to respond, about just vagaries of the virus that people don’t fully understand yet."

Covid-19 and Americans' response to it still has many citizens weary from years of mask debates and misinformation wars. Wu told Rosin, "The public is still really fatigued from having to respond to all of that — there was a lot of trust in public health and science eroded during that time —and I think because of the nature of the slow burn of all this, just slowly percolating through animals, affecting certain farm animals, maybe sort of affecting some aspects of the food supply."

To read more about how bird flu could mutate into something much more harmful for humans, read Rosin's full transcript here or listen to the podcast. To explore a more complete snapshot of bird flu's effect on the the U.S. economy, click here.