More than half of the nearly 800 students, faculty and staff members who were quarantined following exposure to the measles virus at two Los Angeles universities have been cleared to resume their normal activities.

The quarantine marked one of the most sweeping efforts by authorities to contain the nation’s measles outbreak, where cases have reached a 25-year high.

The people at California State University, Los Angeles, and the University of California, Los Angeles, were cleared after providing proof of immunity.

A runner passes the Ronald Reagan UCLA Medical Center on the campus of the University of California, Los Angeles Friday, April 26, 2019. (AP Photo/Reed Saxon)
A runner passes the Ronald Reagan UCLA Medical Center on the campus of the University of California, Los Angeles Friday, April 26, 2019. (AP Photo/Reed Saxon)

At the Cal State campus, 313 students and employees were cleared by Monday, with 343 still under quarantine.

Officials said they may have been exposed to an infected student who visited a school library.

At UCLA, only 27 people remained quarantined. People quarantined at that campus were in classes attended by an infected student.

Count of U.S. measles cases since 2010;
Count of U.S. measles cases since 2010;

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