Yellow Fever is a serious *viral* infection spread by infected mosquitoes, primarily found in tropical and subtropical regions of Africa and South America. It is an acute hemorrhagic disease that can cause *jaundice*, giving it its name, and can be life-threatening.
Transmission methods vary. Please consult CDC or WHO resources for specific information.
Contagious Period: Varies by disease
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Venezuela reports 36 confirmed yellow fever cases across 14 states from June 2025 to January 2026 and extensive epizootic activity in eight states, marking the country's most significant yellow fever event since 2005. The outbreak is part of regional intensification across South America during 2024–2026, with the virus spreading beyond traditional endemic areas to previously low-risk regions. An emergency vaccination campaign targeting four priority states aims to rapidly increase population immunity during the peak transmission season, though coverage gaps and geographic limitations may constrain outbreak control.
Source: BEACON - View Full Report
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Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-03-05
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