Situation Report #15: Measles in the Americas Region. 6 November 2026

Summary of the situation

Between epidemiological week (EW) 1 and EW 43 of 2026 (which ended on 31 October 2026), the Region of the Americas reported 57,666 confirmed cases of measles in 17 countries and territories, representing a 4.7-fold increase compared with the same period in 2025. 

\Guatemala (34,748), Mexico (13,761), the United States (4,852), Peru (2,862), and Canada (1,126) account for the vast majority (99.5%) of confirmed cases (Map 1). A total of 81 deaths has been reported, including 53 in Guatemala, 23 in Mexico, three in the United States of America, one in Peru and one in Bolivia. 

During EW 41 and EW 42 of 2026, the Region of the Americas reported 547 new confirmed cases of measles in six countries and territories, representing a 38% decrease compared with the previous two-week period (EW 39–40; 885 new cases, including 242 retrospectively reported since the last Regional Situation Report). Of the 547 new confirmed cases reported during EW 41–42, the United States accounted for 332, followed by Guatemala 115, Peru with 66, Mexico with 29, Bolivia with four, and Canada with one.