Mass quarantine in California for those who may have been exposed to measles

Health officials scrambling to contain one of the most contagious viruses in the world.
2:03 | 04/27/19

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Transcript for Mass quarantine in California for those who may have been exposed to measles
Now to health officials scrambling to contain one of the most contagious viruses in the world expanding a mass quarantine in California for hundreds of students and staff at two universities who may have been exposed to measles. ABC's Maggie Rulli is at UCLA with the latest. Good morning, Maggie. Reporter: Well, Eva, here at UCLA this quarantine all comes down to one student who authorities say had measles and came to classes here on campus. But the big fear is that one student could infect hundreds. This morning, California's under one of its largest quarantine orders in state history fighting to keep the infectious disease under control. One person with a confirmed measles case can expose thousands of people. Reporter: Over 1,000 students and staff were ordered into isolation at both UCLA and Cal state L.A. After the CDC confirmed a measles outbreak. An airborne disease, the virus can survive for hours after an infected person passes through I actually had a class with the student who was contagious and the school needed my records as soon as possible. Reporter: With the combined student body of over 65,000 between the campuses, an unvaccinated person exposed has a 90% chance of catching it. With a rise in measles nationwide, doctors reporting nearly 700 cases across 22 states this year alone. 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. Reporter: Due in part to the misinformation about the safety of vaccines, the president once tweeting in support of anti-vaxxers is now weighing in on the national health crisis. They have to get the shot. The vaccinations are so important this. This is really going around now. They have to get their shots. Reporter: Officials say those quarantined will be held for 24 to 48 hours until they can prove their immunity but if they can't they could be held for up to a week. Diane. Maggie Rulli reporting in from California.

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

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