By the end of epidemiological week 28, on July 18, 2026, countries and territories in the Americas had reported 47,459 confirmed measles cases and 44 deaths. The number of cases is more than three times the 15,011 confirmed cases recorded throughout 2025. Guatemala, Mexico, the United States and Peru account for 95% of confirmed cases reported in the region this year. Guatemala has recorded the largest outbreak, with 30,371 confirmed cases and 26 deaths, followed by Mexico with 12,255 cases and 17 deaths. With the Americas recording its highest number of confirmed measles cases since 2004, health authorities face growing pressure to close immunity gaps and prevent further spread.