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.

Yacold 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 and welcome to COVID quickly, 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 Tanya Lewis.

I'm Josh Fishman.

And we're Scientific American Senior Health Editors.

Today we'll talk about the plan for a second vaccine booster shot.

The prospects of a new COVID wave and whether people will put on masks to stop it.

And how to think about COVID risk when it comes to everyday activities.

This week, the FDA authorized a second booster shot on top of the ones given last year.

That would be four shots total for me, Tanya. Why this new one?

It happened sooner than I expected, Josh,

although the scientific community had been debating whether additional booster shots were needed

for some time. Normally, the FDA holds a meeting of its advisory committee before deciding

whether to authorize vaccines or boosters. But that didn't happen this time. The move makes

boosters available to adults

...