Hannah Rosen

So the possibility that the virus will keep evolving and become a real threat to humans is really just growing every day.

So the possibility that the virus will keep evolving and become a real threat to humans is really just growing every day.

So the possibility that the virus will keep evolving and become a real threat to humans is really just growing every day.

So there are probably two relevant timelines here. The first is just to remind people that this particular version of bird flu that scientists also call H5N1, you might hear about other bird flus, but this is a very specific one that we're talking about right now. Scientists have known about this for decades, and it has for most of that time stayed primarily in birds.

So there are probably two relevant timelines here. The first is just to remind people that this particular version of bird flu that scientists also call H5N1, you might hear about other bird flus, but this is a very specific one that we're talking about right now. Scientists have known about this for decades, and it has for most of that time stayed primarily in birds.

So there are probably two relevant timelines here. The first is just to remind people that this particular version of bird flu that scientists also call H5N1, you might hear about other bird flus, but this is a very specific one that we're talking about right now. Scientists have known about this for decades, and it has for most of that time stayed primarily in birds.

Very occasionally, it was causing some problems in people when it was transmitting directly from birds into people, like these included poultry workers, people working very closely with wild or domesticated birds. And it would cause sickness, sometimes very severe sickness in people, but...

Very occasionally, it was causing some problems in people when it was transmitting directly from birds into people, like these included poultry workers, people working very closely with wild or domesticated birds. And it would cause sickness, sometimes very severe sickness in people, but...

Very occasionally, it was causing some problems in people when it was transmitting directly from birds into people, like these included poultry workers, people working very closely with wild or domesticated birds. And it would cause sickness, sometimes very severe sickness in people, but...

What is happening on a much more accelerated timeline is all of a sudden after decades of still mostly being a bird virus and causing limited problems in people, limited in terms of spread, this virus is now jumping across species barriers into animals like us very, very, very frequently. And this has only happened in the past couple of years.

What is happening on a much more accelerated timeline is all of a sudden after decades of still mostly being a bird virus and causing limited problems in people, limited in terms of spread, this virus is now jumping across species barriers into animals like us very, very, very frequently. And this has only happened in the past couple of years.

What is happening on a much more accelerated timeline is all of a sudden after decades of still mostly being a bird virus and causing limited problems in people, limited in terms of spread, this virus is now jumping across species barriers into animals like us very, very, very frequently. And this has only happened in the past couple of years.

And to see those types of changes, those types of unprecedented jumps on a much shorter timeline has made a lot of scientists nervous. They don't know what this virus is fully capable of in an evolutionary sense. And it may actually even depend on the subtype of this particular bird flu that is moving around. There are actually already two subtypes of H5N1 that have been detected in people.

And to see those types of changes, those types of unprecedented jumps on a much shorter timeline has made a lot of scientists nervous. They don't know what this virus is fully capable of in an evolutionary sense. And it may actually even depend on the subtype of this particular bird flu that is moving around. There are actually already two subtypes of H5N1 that have been detected in people.

And to see those types of changes, those types of unprecedented jumps on a much shorter timeline has made a lot of scientists nervous. They don't know what this virus is fully capable of in an evolutionary sense. And it may actually even depend on the subtype of this particular bird flu that is moving around. There are actually already two subtypes of H5N1 that have been detected in people.

The one that seems to be jumping into people from birds, for instance, seem to be causing much more severe illness so far than the one that's jumping into people from cattle. And so it depends on all these different biological factors which scientists are still figuring out. But I guess the scary part of that is we don't fully know

The one that seems to be jumping into people from birds, for instance, seem to be causing much more severe illness so far than the one that's jumping into people from cattle. And so it depends on all these different biological factors which scientists are still figuring out. But I guess the scary part of that is we don't fully know

The one that seems to be jumping into people from birds, for instance, seem to be causing much more severe illness so far than the one that's jumping into people from cattle. And so it depends on all these different biological factors which scientists are still figuring out. But I guess the scary part of that is we don't fully know

what the average human sickness with this particular bird virus is going to look like.

what the average human sickness with this particular bird virus is going to look like.