Epidemiological Alert: Yellow fever in the Americas Region - 13 March 2026.

Since September 2024, cases of yellow fever have been reported in areas with no history of transmission, including cases identified outside the Amazon region. In response to this situation, the Pan American Health Organization / World Health Organization (PAHO / WHO) is reinforcing its call to Member States to strengthen surveillance, intensify vaccination of at-risk populations, and take the necessary measures to ensure that people traveling to areas with reported cases are properly informed and protected against yellow fever. In addition, it highlights the need to strengthen clinical management, with an emphasis on the detection and timely treatment of severe cases. PAHO/WHO also recommends having reserve doses available, according to the availability of vaccines in each country, to ensure a rapid response to possible outbreaks.