UCLA said 117 students and faculty are being held while they await medical records to determine whether they're immune to the illness. More than 500 students, faculty and staff who may have come into contact with a student who contracted measles were screened. The student with measles attended classes at Franz Hall and Boelter Hall on April 2, 4 and 9 while contagious, according to UCLA.
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"We expect that those notified will be quarantined for approximately 24-48 hours until their proof of immunity is established. A few may need to remain in quarantine for up to seven days. We have arranged for those who live on campus to be cared for at UCLA while they are quarantined," UCLA said in a statement.
Some students at UCLA said they were unaware of the quarantine order.
A person with measles visited CSU Los Angeles' Library North on April 11 from 11 a.m. to 3 p.m. As a result, university officials said 127 staff employees and 71 student employees were sent home under quarantine orders and told to stay home to avoid contact with others as much as possible.
Cal State LA students on edge over measles quarantine orders
"The Department of Public Health has determined that there is no known current risk related to measles at the library at this time," CSU Los Angeles said in a statement.
The Los Angeles County Department of Public Health said it's working with both universities "to institute a series of actions to limit the spread of measles based on its assessment of the previously identified measles cased."
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County health officials held a press conference Thursday, urging residents to get vaccinated immediately.
Measles is highly contagious and can stay in the air for up to two hours after an ill person coughs or sneezes, and can stay on surfaces for several hours, health officials say. About 90 percent of people who are exposed and not immune to the illness become sick 7 to 21 days after exposure.
The county public health department says schools are "high-risk setting for exposure due to potentially frequent and prolonged contact."
MORE: Measles outbreak - many of those susceptible to infection are college age
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The Centers for Disease Control and Prevention says the United States now has the highest number of measles cases in a year since measles were eliminated in 2000, with 695 measles cases reported in 22 states.
Los Angeles public health officials declared a measles outbreak in the county, making it the latest metro area to be struck by the illness.
Related: LA County issues warning after five measles cases reported
Measles symptoms include fever, dry cough, runny nose, sore throat and red, watery eyes. Three to five days after symptoms begin, the CDC says a rash breaks out which appears as flat red spots on the face at the hairline and spread downward to the neck, trunk, arms, legs and feet. Small raised bumps may also appear on top of the flat red spots.