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. Track Yellow Fever activity and outbreaks specific to Oregon.
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Yellow Fever has caused devastating epidemics for centuries, significantly impacting human history and major construction projects like the Panama Canal. In the early 20th century, research led by Walter Reed confirmed that mosquitoes transmit the virus. A highly effective vaccine was later developed in the 1930s by Max Theiler.
Yellow Fever is transmitted to humans through the bite of infected *Aedes* and *Haemagogus* mosquitoes. These mosquitoes acquire the virus by feeding on infected humans or non-human primates (monkeys). The disease cannot be spread directly from person to person.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
Our AI-powered surveillance continuously monitors Yellow Fever activity across Oregon. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
Get instant push notifications when Yellow Fever activity increases in Oregon or your specific county.
For official state health alerts, vaccination locations, and public health guidance specific to Oregon, visit your state health department's website.
Whether you live in Oregon, are traveling there, or have family in the state, understanding Yellow Fever prevention is essential. Follow these evidence-based prevention measures:
If you experience symptoms of Yellow Fever in Oregon, contact your healthcare provider immediately. Early diagnosis and treatment improve outcomes significantly.
Emergency symptoms: If you experience severe symptoms, difficulty breathing, or signs of dehydration, call 911 or go to your nearest emergency room.
Trusted information from leading health organizations
Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources →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: 2026-06-03
No confirmed cases reported in Oregon yet. Here are the latest Yellow Fever reports from our global surveillance network.
Yellow fever cases in the Americas are emerging in both endemic and previously unaffected regions. This suggests that sylvatic transmission is expanding into montane and transitional forest areas, raising concerns about cross-border spread and the risk of urban reintroduction.Cou…
This event envelope contains reports on yellow fever cases and outbreaks in Bolivia.Yellow fever situation in the Americas *Source: BEACON* - [View Full Report](https://beaconbio.org/en/event/?eventid=5c7655f2-45aa-4610-806e-e366bf8c6c41)
Colombia's yellow fever outbreak continues into 2026, with 30 confirmed cases and 11 deaths reported as of March 17, 2026. Three deaths occurred among Bogotá residents who traveled unvaccinated to endemic areas, highlighting critical gaps in pre-travel health preparedness and pub…
This event envelope contains reports on yellow fever in Brazil. *Source: BEACON* - [View Full Report](https://beaconbio.org/en/event/?eventid=54adaa93-087d-41e0-a6dc-bc644325b98e)
Brits with travel plans to certain destinations have been put on alert as cases of a dangerous viral illness have surged in recent years. In 2025, yellow fever cases rocketed to 5.6 times the number recorded the year before. Yellow fever is transmitted by mosquitoes across parts …
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 …
Costa Rica has confirmed an imported case of yellow fever. This discovery necessitates an immediate public health response to prevent potential local transmission and outbreak of the severe mosquito-borne disease. <!-- hash:d13296a45eb402c07f55bc6df3ffe8fc -->
Trinidad and Tobago confirmed yellow fever virus in a deceased Red Howler monkey on 24 Mar 2026, indicating active sylvatic transmission in forested areas with no human cases reported. The detection aligns with Trinidad's endemic pattern of periodic wildlife epizootics and has tr…
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