Measles Cases Continue to Rise, Highlighting the Importance of MMR Vaccination

The United States is seeing a major measles resurgence in 2026. As of May 7, 2026, CDC reported 1,842 confirmed measles cases across 39 jurisdictions, with 25 outbreaks and 93% of cases linked to outbreaks. This is especially concerning because measles is one of the most contagious human viruses, but it is also highly preventable through vaccination.

CDC states that one dose of MMR vaccine is about 93% effective against measles and two doses are about 97% effective. Recent research has also identified human antibodies that may one day help protect exposed or vulnerable people, but experts emphasize that antibody treatment would not replace vaccination.

Yes2Vaccines message: Measles outbreaks are not inevitable. High vaccination coverage remains the most effective way to prevent spread.