Situation Report #5: Measles in the Americas Region. 18 June 2026

Between epidemiological week (EW) 1 and EW 23 of 2026 (ending on 13 June 2026), the Region of the Americas reported 22,324 confirmed measles cases from 17 countries and territories, including 38 deaths, representing a 207% increase compared to the same period in 2025. Mexico (11,532), Guatemala (6,895), the United States (2,073) and Canada (1,071) accounted for the majority (97%) of confirmed cases.

During EW 21 and EW 22 of 2026, the Region of the Americas reported 827 new confirmed measles cases across seven countries and territories, representing a 29.1% decrease compared with the previous two-week period (EW19-20; 1,166 new cases). This decline was driven primarily by continued decreases in Canada and Mexico. The United States showed plateauing trends, while Peru's recent weekly case counts appear stable at the national level, with transmission remaining concentrated in Puno. Trends in Guatemala should be interpreted with caution, given possible reporting delays or updates in recent weeks.

In the context of the upcoming FIFA World Cup 2026™, countries are encouraged to strengthen preparedness and prevention measures, particularly in host countries and in countries receiving travelers returning from areas with active transmission. This includes ensuring early detection and reporting of suspected measles cases, strengthening laboratory capacity for timely testing and confirmation, and maintaining timely investigation and response capacities.