Measles cases in the Americas have reached their highest level in 22 years, prompting the Pan American Health Organization (PAHO) to call for stronger vaccination, surveillance and rapid outbreak response across the region. As of July 18, 2026, countries and territories in the Americas had reported 47,459 confirmed measles cases and 44 deaths. The figure is more than three times the 15,011 cases recorded during the whole of 2025, highlighting a sharp deterioration in regional measles control. Guatemala, Mexico, the United States and Peru account for 95% of confirmed cases reported so far in 2026. World Health Organization data show that 186,168 measles cases had been reported worldwide by July 2026, 12% higher than during the same period in 2025.