Disneyland is having a measles outbreak. There has been 19 measles cases reported so far, according to an NBC affiliate. California health officials are becoming more concerned over the number of people contracting the contagious disease.

The California Department of Public Health and the Orange County Health Agency said 19 people were exposed to measles at Disneyland or Disney California Adventure between Dec. 15 and 20. The park’s visitors were from three states who visited the theme park last month. Sixteen of the cases were from California, two in Utah, and one from Colorado. Before the December cases, 2014 was already the worst year for measles cases in California in nearly two decades.

Officials in California said that of the 16 cases in the state, only two people were fully vaccinated against the disease. Some were partially vaccinated and at least two were too young to be vaccinated.

Nicole Stanfield, a spokeswoman for the Orange County’s health care agency, urged anyone with measles symptoms to call their doctor before seeking medical attention to avoid exposing others to the highly contagious illness.

“The medical provider may visit them in the car or may have a special room for them to go where they’re not contaminating everyone else in the waiting room.”

Last week 9 cases were reported, making the current total to 19 a growing concern. Disney officials are dealing with the measles outbreak and said they are working with public health authorities to provide any necessary assistance.

Measles is a highly contagious virus that lives in an infected person’s nose and throat mucus and spreads through coughing and sneezing. Symptoms include fever, cough, runny nose and red eyes and a red rash that usually first appears on the face and spreads to the rest of the body.

When the Disneyland measles cases were reported last week, three of the children were said to have not had vaccinations. Out of the three adults, one was not vaccinated. The adults were not hospitalized.

The best prevention against measles is vaccination. Children should get their first vaccination between 12 and 15 months of age, with a second dose between 4 and 6 years old before going to school. Measles was declared eliminated in the United States in 2000. However measles can still be brought into the country by foreign visitors or Americans who have not had vaccinations.

State health officer Ron Chapman said in a statement after the Disneyland measles cases were confirmed, “If you have symptoms, and believe you may have been exposed, please contact your healthcare provider. The best way to prevent measles and its spread is to get vaccinated.”

[Photo Credit: Jason Short 2008 via photopin cc]

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