Alex met Sam at nursery. They were first loves. They built forts together, shared sandwiches in high school and were each other's first kiss.

They were the dream couple until Sam got into EDM music.

While Alex enjoyed folk, first loves are kind of like your current account. If they aren't working for you anymore,

maybe it's time to switch with the current account switch service.

Good morning. Welcome to Axios today. It's August 18th and we made it to Wednesday. I'm Nyla Boudou.

Here's what you need to know today. What the new school year looks like for parents across America.

Plus, companies prioritize employee mental health.

But first, the language around COVID boosters is today's one big thing.

Today, President Biden is expected to announce his administration's recommendation for a third dose of the COVID vaccine for all vaccinated Americans.

This follows the CDC and FDA approval last week of a third shot for those who are immunocompromised.

We've had a lot of questions about what to expect with a third dose.

And Axios' healthcare editor, Tina Reed, is here now to help answer some of those questions.

Good morning, Tina. Good morning, Nyla.

Tina, this whole thing came to my attention because a listener, Kristen, who's a pharmacist, texted me about the language we've been using.

Is there an important distinction we should make between the idea of a third dose versus a booster?

There is. And I will say there are a little bit of semantics going on, but they are valuable.

What the data has shown is that among some immunocompromised people, they haven't had as robust response to the vaccine as people who are otherwise healthy.

And they're trying to make up for that with a third dose of one of these MNRA vaccines.

When we talk about boosters in the way that many people think about boosters, that is really an additional set of antibodies as they see weighting immunity from the vaccine.

And that's in healthy people.

We keep hearing this term immunocompromised.

When it comes to a third dose of the vaccine, who specifically is the administration talking about?

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