She didn't describe what penalties those who don't could face.
Cal State LA's Student Health Center cleared students and staff who provided the required proof of immunization.
Eden Guerra, a kinesiology major, was surprised classes weren't canceled, noting, "This is like serious, like it's life, you know".
More than 1,000 students and staff members at two U.S. universities have been quarantined or sent home in a bid to stop a measles outbreak.
Officials said the quarantine would end at UCLA on Tuesday and at California State University on Thursday. Only one person remained there Friday.
At UCLA, 119 students and eight staff members who were exposed to measles at the campus earlier this month and could not provide proof of immunity were ordered quarantined on Wednesday, the university said in a statement.
The order issued this week initially covered more than 200 people at the University of California, Los Angeles, and Cal State Los Angeles, but dozens have already been released.
About 127 people were quarantined at UCLA for at least one day, university officials told the Los Angeles Times. Nationwide, the government has counted almost 700 measles cases, roughly three-quarters of them in NY state, which had among the largest and longest-lasting outbreaks since the disease was all but eliminated in 2000.
The Los Angeles County Department of Public Health says the number of confirmed cases among county residents remains at five.
Health officials also said that a passenger who flew to and from Los Angeles International Airport on April 18 was confirmed with a case of measles, the fourth at the airport.
At this time, the Department of Public Health is urging all individuals in the university community to visit the Student Health Center or a primary doctor to arrange for an appointment to get tested and vaccinated. Fourteen of those infected had traveled overseas to countries including the Philippines, Thailand, India and Ukraine.
Measles in the United States has reportedly climbed to its highest level in 25 years, closing in on 700 cases this year in a resurgence largely attributed to misinformation that is turning parents against vaccines. She has covered sports, entertainment and many other beats in her journalism career, and has lived in NY for more than 6 years.
In Rockland County, officials declared a state of emergency and at one point tried to bar unvaccinated children from schools and other public places, but a judge overturned the order. City officials said earlier this week that 12 people had been issued summonses.
Common symptoms associated with measles include fever, cough, runny nose, red eyes and a rash which usually appears 10 to 21 days after exposure.
According to the Centers for Disease Control and Prevention, this is the worst outbreak of the virus since it was eradicated in the USA nearly 20 years ago.
Ferrer said her department was coordinating with LAX officials to make sure that the word about free vaccines got out to 7,000 workers at LAX, identified as a point of potential exposure on April 1. The schools said they're trying to identify anyone the infected persons may have exposed.