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Number of Measles Cases Have Increased

4-8 measles vaccine(CNN) — The Centers for Disease Control and Prevention said the number of measles cases in the United States has risen to 288 so far this year. The highest number for one year since at least 2001. The CDC said that 90 percent of all measles cases in the United States were in people who were not vaccinated or whose vaccination status was unknown.

Serious complications and death may result from measles, which is highly contagious.