The Washington State governor declared a state of emergency on Friday in the outbreak of
One case was confirmed in King County, Seattle. He included a 50-year-old man who was hospitalized.
Clark County, which is in the southwest of Washington and near Portland, has a lower vaccination rate than almost any other state in the state. Only 77.4% of all state students there complete their vaccinations, according to state documents quoted by Oregon. Measles is a highly contagious and potentially lethal infection that is most common in young children, although it is easily preventable by vaccination. Symptoms include cough, runny nose, sore throat, fever and spots on the skin. The disease is so contagious that 90 percent of people close to someone who is not immune will be infected, according to the Centers for Disease Control and Prevention.
The source of the outbreak affecting Washington has not been determined.