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As of February 2026, there were a total of 733 cases of measles in the United States. Around 95 percent of these cases were among those who were unvaccinated or whose vaccination status was unknown. In 2025, there were 2,276 cases of measles, with those who were unvaccinated or with an unknown vaccination status accounting for 93 percent of these cases. Measles is a highly contagious disease that can be especially dangerous for young children. Vaccines against measles resulted in a significant decrease in cases in the United States over the last few decades; however, increasing vaccine hesitancy and skepticism have been blamed for recent outbreaks.