From the tip of December 2024 to April 26 of this yr, 5 nations within the Americas confirmed 212 yellow fever circumstances and 85 associated deaths, for a case-fatality price of 40%, the World Well being Group (WHO) mentioned in any replace right this moment.
These numbers signify a greater than tripling of circumstances of the mosquito-borne illness recorded for all of 2024, the company mentioned.
Most circumstances, deaths in Brazil
The 212 circumstances had been confirmed from December 29, 2024, by April 26, 2025, with knowledge for Ecuador analyzed by Could 2. Brazil has essentially the most circumstances and deaths—110 and 44, respectively. Colombia has 60 circumstances and 24 deaths, Peru 35 circumstances and 12 deaths, Ecuador 4 deadly circumstances, and Bolivia, 3 infections, together with 1 deadly case.
“In 2024, human circumstances of yellow fever had been reported primarily throughout the Amazon area of Bolivia, Brazil, Colombia, Guyana, and Peru,” the WHO mentioned. “In 2025, nevertheless, circumstances have been detected primarily in areas exterior the Amazon area, together with within the state of São Paulo, Brazil and the Tolima division, Colombia.” Final yr, the Americas area had 61 confirmed yellow fever diseases.
The 5 affected nations have carried out actions to answer the outbreaks, specializing in strengthening preventive measures, bettering surveillance, and implementing immunization campaigns.
The WHO decided that the danger of yellow fever unfold within the area is excessive. “The prevalence of yellow fever circumstances exterior of the Amazon basin, mixed with excessive fatality, various vaccination protection throughout affected nations, and restricted vaccine provide, contributes to the general classification of yellow fever threat within the Area of the Americas, particularly in endemic nations, as excessive,” the company mentioned.
“WHO emphasizes the significance of energetic surveillance, well timed laboratory testing, cross-border coordination, and data sharing. Vaccination stays the first means for the prevention and management of yellow fever.”
