( CNN ) The happiest place on Earth just got a bit sadder for some of its employees . Due to a recent measles outbreak , several Disneyland workers are being tested for the virus . Five employees were diagnosed with measles , and three of them have fully recovered , Disneyland says . `` The measles outbreak exposure period of December 17-20 at the Disneyland Resort is over , and all cases from this exposure should have occurred by January 10 , 2015 , '' the California Department of Public Health says . `` No new cases have been identified in guests who visited after that time period . '' Disneyland said it was informed of measles cases among employees on January 15 . Measles is a respiratory disease caused by a virus and spread through the air , according to the Centers for Disease Control and Prevention . As for symptoms , `` measles starts with a fever , runny nose , cough , red eyes and sore throat , '' the CDC says . The outbreak apparently surfaced with five Disney employees who were diagnosed with measles , three who have fully recovered , Disneyland says . Disneyland said it was informed of measles cases among employees on January 15 . Previously , public health officials in California and Utah confirmed nine cases among visitors to either Disneyland or Disney California Adventure Park . After Orange County health officials notified Disneyland of that on January 7 , `` We immediately began to communicate to our cast to raise awareness , '' the theme park 's Chief Medical Officer Dr. Pamela Hymel said in a statement . Disneyland refers to its employees as cast members . `` In an abundance of caution , we also offered vaccinations and immunity tests . To date , a few Cast Members have tested positive and some have been medically cleared and returned to work . Cast Members who may have come in contact with those who were positive are being tested for the virus . While awaiting results , they have been put on paid leave until medically cleared . '' It 's not clear how many of the theme park employees were vaccinated . So far , five children and 13 adults have been diagnosed with measles in Orange County , according to the county health agency . One school in Huntington Beach has barred children who could not prove that they were vaccinated for measles from going to school until January 29 , according to the county health agency . Those showing measles symptoms should n't be bashful about seeing their doctor , because a full body rash is likely to break out next . `` If you have symptoms , and believe you may have been exposed , please contact your health care provider , '' said Dr. Ron Chapman , director of the state health department . Vaccination is key . `` Two doses of measles-containing vaccine ( MMR vaccine ) are more than 99 percent effective in preventing measles , '' the press release said . `` Measles vaccines have been available in the United States since 1963 , and two doses have been recommended since 1989 . '' Measles was considered eliminated in the United States in 2000 , though 2014 saw a record-breaking number of confirmed cases : 644 from 27 states , according to the CDC . That 's `` the highest number of cases since measles elimination was documented in the U.S. in 2000 , '' the CDC says on its website . `` Travelers to areas where measles is endemic can bring measles back to the U.S. , resulting in limited domestic transmission of measles , '' read a statement from the California Department of Public Health . `` Disney and other theme parks in California are international attractions and visitors come from many parts of the world , including those where measles is endemic . '' 5 things to know about measles . CNN 's Kevin Conlon contributed to this report .
California health official urges some people to stay away from Disneyland during measles outbreak . Growing number of measles cases linked to Disneyland , health official says . TL;DR A new report shows that the U.S. is experiencing a surge in measles, with more than 100 confirmed cases.