Now from Times Square, here's what you need to know.

Let's bring in Dr. Darien, great to see you.

Great to see you too.

Not a great topic to talk about though off the top.

Measles is continuing to spread across the U.S.

There's this outbreak in Texas that has doubled in case number.

All the people affected are unvaccinated, correct? So if you are vaccinated for measles, which many are, do you need a booster right now?

And can people know for sure they are protected?

That's a great question.

You know, these numbers are doubling mainly because measles is so contagious.

Again, it's one of the most contagious infectious diseases that we will see

in our lifetime. And it's expected, not just in Texas, but also neighboring states and other

states. There's at least 15 states that have documented cases of measles. And as you said,

most of these cases are unvaccinated and unfortunately, mostly children. So to answer your question

in terms of what do we know about the MMR vaccine, measles, mums, and rebella,

many people don't remember it because we often get vaccinated when we're in our school age.

And so this is what you need to know in terms of how beneficial it is and how protective it is.

Number one, two doses, which are usually given about a month apart are about 97% effective.

So the general risk to the vaccinated person is relatively low.

Even one dose can provide 93% effectiveness. And vaccination after a recent exposure within three

days can also provide some significant benefits. Boosters are getting another dose are generally

not recommended for the general population of the community. But if you are in one of these

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