What to know about the Los Angeles measles quarantine

ABC News' Dr. Jennifer Ashton shares the latest on the measles outbreak after hundreds of students and faculty at UCLA and Cal State were quarantined.
1:32 | 04/26/19

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Transcript for What to know about the Los Angeles measles quarantine
emergency. It's led to two massive quarantines at two universities in Los Angeles. CDC says 700 measles cases have been reported across the U.S. And we want to bring in Dr. Jen Ashton on this. Pretty scary stuff the way it is spreading. If people had the vaccine years and years ago, do they have to be worried? They really don't have to be tested. That's not what the blood test was designed for. If you think you've been vaccinated you do not need to think about getting that blood test. Often the results can put us in a gray zone and recommend another vaccine. How about booster shots. No booster shot necessary for measles. If you are vaccinated you're considered to have lifelong immunity. We should not sugar coat this. Measles is dangerous. I mean, this is something that we have to put in context historically and medically. Most health care providers have never seen a case of measles since it was considered eradicated in the U.S. Back in 2000. Now we're likely going to see the highest numbers in 25 years. It absolutely can be deadly. There is about one in two out of a thousand cases can be deadly especially for children. And, remember, in terms of the symptoms, which most people have never seen, we're talking about things that can look like the common cold only worse, cough, red eye, runny nose, a rash that appears three to five days after the symptoms start, very high fever. The tragic thing with this, George, and we can't emphasize this, this outbreak is avoidable and it is preventable. You can be infectious before the rash shows up. Exactly. Okay, Dr. Jen Ashton, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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