Long Beach Health Department officials have notified the students about the measles exposure and asked them to review their immunization records, said Dr. Mitchell Kushner, the city health officer.
"This isn't a campus-wide thing," he said.
The students went on an off-campus field trip with the infected student during winter break, which started Jan. 12. It is unclear whether the field trip was a campus-sponsored event.
Kushner said the infected student, who lives in Orange County, has recovered and appears to be doing well. She did not live on campus.
Kushner did not know how the student became infected with measles.
The city's health department is working with Orange and Los Angeles counties to determine if there were any other cases.
A measles outbreak began in California after several people were exposed to the highly contagious virus while visiting Disneyland Resort between Dec. 17 and 20.
Health officials say there are 87 confirmed cases in seven states and Mexico.
On Friday, Santa Monica High School students and parents were notified about a measles scare on their campus.
A freshman baseball coach was diagnosed with measles. School officials investigated for possible exposure and determined it was unlikely students caught the virus.