Reinforcing measles control in the Americas amid mass gatherings: detection, response, and traveler health implications

[EXTRACT]. 17 JUNE 2026, WASHINGTON, D.C. — More than 184 000 suspected measles/rubella cases have been reported worldwide in 2026, reflecting widespread transmission across all WHO regions. In the Americas Region, confirmed cases have reached 20 521 by EW 20 -- with 25 deaths -- representing a four-fold increase from the number reported in the same period in 2025. Against this backdrop, mass gatherings and cross-border travel act as amplifiers of transmission, particularly in populations with suboptimal vaccination coverage. Strengthening active case-finding, maintaining high immunity levels, and ensuring pre-travel vaccination are essential to reducing the risk of measles importation and onward spread.