Chart shows weekly measles cases in the U.S. The weekly case count was under 15 cases for most of 2024, with one outbreak of 38 cases in the week of March 17, 2024. There was a large surge of measles cases during February and March of 2025, with weekly cases hovering around 80, reaching 115 during the week of March 30th. Weekly cases have dropped slightly since, with weekly cases hovering between 20 and 40 after May 2025.