Measles Outbreak Usa 2025. Americans have reported a total of 338 cases since january 1, 2020—and 97 cases, or 29 percent of the total, came between the start of 2025 and march 28, per the report. For example, in a recent outbreak in ohio, over 40% of.

Several outbreaks, including one in chicago, led to an early spike in measles cases this year. Measles cases globally have been rising, with an increase in what the world health organization deems large or.