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For Scientific American Science quickly, I'm Rachel Feltman. More than 1,000 cases of measles have been confirmed in the U.S. since late January,

including a cluster in West Texas that has caused one of the worst outbreaks in recent memory.

These outbreaks are occurring even though measles was technically eliminated in the U.S. back in 2000.

Here to explain what that means and why that status could be at risk is Lauren Young,

Associate Editor for Health and Medicine at Scientific American.

Lauren, thanks so much for coming on to chat with us today.

No, thank you for having me.

So to refresh our listeners' memories, could you give

us a brief overview of the current measles outbreaks of concern? Sure. So the situation

continues to worsen in the U.S. Measles cases are continuing to rise. The current case count as of

May 1st of the CDC's reports says 935 confirmed cases, which is growing at a pretty

alarming rate. The initial outbreak began in West Texas and now it's in 29 states, and we're also

seeing cases and outbreak spread in Mexico and Canada. So it's important to note, too, that nearly

70% of the confirmed cases have been in younger people, ages 19 and below,

and a large proportion of those cases are in unvaccinated people, which, and this is a concern,

because measles is very highly contagious. It's known for, you know, spreading via cough. It's also

known for creating a rash, which is pretty uncomfortable, coughing and runny nose,

...