Dengue Fever
10 Active OutbreaksDengue is a mosquito-borne viral infection that causes flu-like illness and can develop into severe dengue, a potentially lethal complication. It is endemic in more than 100 countries, primarily in tropical and subtropical regions.
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What is Dengue Fever?
Dengue fever is one of the fastest-growing mosquito-borne diseases globally. Approximately half of the world's population is now at risk, with an estimated 390 million infections occurring each year. Climate change is expanding the range of Aedes mosquitoes that transmit the disease, bringing dengue to new regions.
Symptoms
- High fever (104°F/40°C)
- Severe headache
- Pain behind the eyes
- Severe joint and muscle pain (breakbone fever)
- Rash (appears 2-5 days after fever)
- Nausea and vomiting
- Mild bleeding (nose, gums)
Transmission
Dengue is transmitted through bites from infected Aedes aegypti and Aedes albopictus mosquitoes. These mosquitoes become infected when they bite a person with dengue virus in their blood. The virus cannot spread directly between people.
Contagious Period: Not contagious person-to-person; infectious to mosquitoes from 1 day before fever onset through 5-7 days of illness
Prevention
- Use mosquito repellent containing DEET, picaridin, or IR3535
- Wear long-sleeved shirts and long pants
- Use air conditioning or window/door screens
- Remove standing water where mosquitoes breed
- Use mosquito nets, especially during the day
- Consider dengue vaccine if you live in endemic areas (consult healthcare provider)
- Treat clothing and gear with permethrin
Active Outbreaks & Recent Cases
Real-time intelligence from global health monitoring and AI-powered surveillance
Data sources: BEACON, ProMED, WHO, CDC, and 50+ national health agencies
✓ Live data updated in real-time from global health sources
Dengue Outbreak: Taiwan's First 2026 Case Confirmed in Kaohsiung
Autochthonous transmission of dengue (type 2) has been reported in Taiwan, with 4 cases in Kaohsiung City. Increased mosquito activity related to rain, especially following typhoons, is thought to be increasing risk of transmission.
Source: BEACON - View Full Report
Dengue, Wallis and Futuna
This event envelope contains reports on Dengue in Wallis and Futuna
Source: BEACON - View Full Report
Samoa Dengue Outbreak Surges: Thousands Infected, Deaths Reported
Dengue transmission continues in Samoa following the outbreak declared in April 2025, with over 17 400 cases and nine deaths as of 08 Mar 2026. Recent decreases in weekly cases, hospital admissions, and laboratory-confirmed infections suggest short-term stabilization; however, transmission remains widespread, with increasing circulation of DENV-2 alongside DENV-1.
Source: BEACON - View Full Report
Dengue Outbreak Sweeps Tonga Islands
This event envelope contains reports on dengue in Tonga.
Source: BEACON - View Full Report
Dengue Surges in El Salvador, Hits Children Hard
This event envelope includes reports on dengue in El Salvador.
Source: BEACON - View Full Report
Dengue, Hong Kong
This event envelope contains reports on Dengue in Hong Kong.
Source: BEACON - View Full Report
Dengue Surge Hits Southern Martinique
This event envelope contains reports on dengue clusters and outbreaks in Martinique.
Source: BEACON - View Full Report
Italy Dengue Cases Surge, Maldives Blamed
This event envelope contains reports on dengue cases and clusters in Italy.
Source: BEACON - View Full Report
Dengue Epidemic Strikes New Caledonia: First Since 2019
This event envelope contains reports on dengue clusters and outbreaks in New Caledonia.
Source: BEACON - View Full Report
Dengue Cases Surge in Honduras Before Rainy Season
Honduras is experiencing a moderate dengue season in 2026, with case counts about half those recorded at the same point in 2025, consistent with the post-epidemic trough following the severe 2024 outbreak. Ongoing circulation of DENV-3 and the concentration of cases in densely populated urban departments sustain the risk of severe disease, particularly among children, as the country enters its higher-transmission rainy season from May to November.
Source: BEACON - View Full Report
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Expert Resources & References
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WHO
Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Medically Reviewed Content
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
Frequently Asked Questions
Common questions about Dengue Fever answered by our epidemiology team
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