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.j.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, 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 Tonya Lewis.

I'm Josh Fishman.

We're Scientific American's senior health editors.

In today's episode, we want to talk about some of the current challenges with using home COVID tests.

When you first have symptoms, a change in how your body reacts to the virus could lead to a test result showing you're negative when you're actually infected.

You know how we try and give people easier ways to understand and use medical research?

Yeah, simplifying complex science is kind of our job.

Well, today we're taking something that seems simple, and we're going to say that it's actually more complicated now.

We're going to say that with COVID home tests, the rapid antigen ones,

it's become a little tougher to get an accurate result. That's bad news, especially if, like me,

you use those tests a lot. You should still use them. They're very good at telling you if you have

COVID. But telling you that you don't have COVID, right, when you start to feel symptoms,

that isn't as easy as it used to be.

You mean that it's possible to get what scientists call a false negative.

...