Official notice from World Health Organization
Yellow fever
Global
- Report type
- Disease Outbreak News
- Published
Disease Outbreak News are WHO's official reports on confirmed or potential acute public-health events. WHO does not assign them levels.
Excerpt from World Health Organization:Yellow fever is a viral disease found in areas of Africa and the Americas, spread by infected mosquitoes. Following an increase of cases in the Americas in 2025, transmission activity remained into 2026.
Read the full official report on who.int3 ways to protect yourself
- Follow the advice of national and local health authorities in the affected area.
- Read the official report for how this disease spreads and which measures are recommended.
- If you develop symptoms after being in an affected area, contact a healthcare provider and mention where you have been.
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Educational information from official sources, not personal medical advice. Not real-time — agencies update notices on their own schedules. In an emergency call 911 (U.S.) or your local emergency number.