What is the cause of most cases of measles in the US?

Updated: Jun 06, 2019
  • Author: Selina SP Chen, MD, MPH; Chief Editor: Russell W Steele, MD  more...
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By 1993, vaccination programs had interrupted the transmission of indigenous measles virus in the United States; since then, most reported cases of measles in the United States have been linked to international travel. [19] By 1997-1999, the incidence of measles had been reduced to a historic low (< 0.5 cases per million persons). From 1997 to 2004, the reported incidence was as low as 37-116 cases per year. From November 2002 on, measles was not considered an endemic disease in the United States.

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