Epidemiological Alert Measles in the Americas Region - 3 February 2026

The sharp increase in measles cases in the Americas Region during 2025 and early 2026 is a warning sign that requires immediate and coordinated action by Member States. The Pan American Health Organization/World Health Organization (PAHO/WHO) urges Member States to prioritize strengthening routine surveillance and vaccination activities and to ensure a rapid and timely response to suspected cases. It also recommends implementing active community, institutional, and laboratory searches for early case identification, as well as developing complementary vaccination activities aimed at closing immunity gaps.