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, visitacolkot.co.j.p.

That's y-A-K-U-L-T-C-O-J-P.

When it comes to a guide for your gut, count on YacLt.

Hi, and welcome to COVID-, 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. This is our Back to School special episode, Part 2. We'll talk about why

so few young children have gotten their COVID vaccines.

And how long we should really be isolating when we get sick.

Many kids are back in or heading back to school and preschool right now.

We know that means the risk of spreading COVID will increase, yet very few young children have gotten the vaccine.

That's right. COVID vaccines have been available for all ages since mid-June, but only about a third of children ages 5 through 11 are fully vaccinated. And among kids under 5, the numbers are

even lower, just a couple percent. That's really low.

Why is it so low?

Well, there are lots of reasons.

The Kaiser Family Foundation polled the parents of young children about why they chose not to vaccinate their child against COVID.

The top reason parents cited was that the vaccines were too new and had not been tested enough.

Others were worried about their child having side effects that would mean having to stay home and look after them. But a considerable group of parents,

...