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The governor of Washington State has declared a state of emergency after the CDC confirms 26 cases of the measles.
Of the 26 confirmed cases, 16 are in kids between the ages of 1 and 10 and four cases are in kids 11 to 18.
The measles is highly contagious and can be deadly if small kids get it.
The most recognizable symptom is a red, blotchy rash but the measles can also cause coughing, runny nose, inflamed eyes, a sore throat and fever.
The decision to declare a state of emergency means state agencies and departments can use state resources to help manage the outbreak.
It also means they can reach out to other states if they need to.