As the number of measles cases continues to rise in Southern California following an outbreak at Disneyland last month, about two dozen unvaccinated students at one Orange County high school have been forced to stay home after a classmate contracted the disease.

In a message to students and parents at Huntington Beach High School on Thursday, Pamela Kahn, health and wellness coordinator at the Orange County Department of Education, said that students "who do not have any documented [measles, mumps and rubella] immunizations will be excluded from attending school until January 29."

The decision was based on a recommendation from Orange County public health officials, Kahn said.

On Friday, Huntington Beach High's principal, Rocky Murray, said a total of 24 students were being kept out of classes, including the one who contracted measles. That student last attended class on Jan. 8, according to the Department of Education.

There were 52 confirmed measles cases as of Friday; 46 of them in California.