PALM DESERT, Calif. » Officials say 66 students at a Southern California high school have been told to stay home through the end of next week because they may have been exposed to measles and are not vaccinated.

The Desert Sands Unified School District says the students were released from class at Palm Desert High School Wednesday. They won’t be allowed to return until Feb. 9 or until they are medically cleared by providing proof of immunity.

A girl was sent home Monday with a suspected case of measles, prompting a round of vaccination checks. She was allowed to return Tuesday.

Meanwhile, 20 students at Cal State Long Beach were exposed to measles when they took a field trip with an infected student during winter break.

The students have been asked to check their immunity.

A recent measles outbreak initially traced to Disney parks has brought nearly 80 confirmed cases in California.