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-L-T.C-O.JP. When it comes to a guide for your gut, a scientific American podcast series.

This is your fast track update on the COVID pandemic.

We bring you up to speed on the science behind the most urgent questions about the virus and the disease.

We demystify the research and help you understand what it really

means. I'm Josh Fishman, Scientific American Senior Health Editor. Tanya Lewis, usually here with me,

has the day off. Today, new research shows how old cold viruses may help protect you against

the coronavirus causing the pandemic. And vaccine makers are not rushing out shots against the Omicron variant,

even though the original shots have lost some effectiveness.

What's the holdup?

We'll explain.

From early in the pandemic,

it's been clear that not everyone is equally vulnerable to SARS-CoV-2, the coronavirus that causes COVID.

Some people get really sick while others have mild symptoms or none at all.

And this was true before any of us were protected by vaccines.

Overall, about 80% of infected people get a mild illness.

The virus is so wildly infectious, though, that the 20% of

serious cases have been a global catastrophe. Five and a half million people dead, 850,000 of them

in the U.S. But in people who don't get very ill, what's protecting them? We hear a lot about

...