Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yachtold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.

.jp. That's Y-A-K-U-Lt.C-O.jp. When it comes to a guide for your gut, count on Yacolt.

Hi, this is Your Health Quickly, a Scientific American podcast series.

We bring you the latest vital health news, discoveries that affect your body and your mind.

And we break down the medical research to help you stay healthy.

I'm Tanya Lewis.

I'm Josh Fishman.

We're Scientific American's senior health editors.

Today we are talking about flu, but not just any flu. This is avian influenza or

bird flu. It's been sickening wild birds and mammals around the world, and it has infected people.

Now it's spreading among U.S. cows, but how big a threat is it to humans?

Bird flu may sound like an innocuous disease that gives sparrows the sniffles,

but it's actually quite a serious pathogen that infects farmed birds like chickens and many

species of wild birds. It can also infect other animals and humans too, and sometimes it can be deadly.

There are a couple of different kinds of bird flu.

The one scientists are watching carefully right now is called highly pathogenic avian influenza

A, or H5N1.

In several bird flu outbreaks, the virus has spilled over into people who had close contact with birds.

It's had a very high mortality rate in those people.

...