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
Live Dengue Fever Global Case Map
6 countries with reported activity. Updated from real-time surveillance data.
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
Yemen's health workers race to halt latest outbreak of deadly dengue fever
Mukalla, Yemen - Under the scorching sun and through heady humidity, Salem bin Shabz and his team of health workers move slowly through the narrow alleyways of Al-Koud, a densely populated slum in Yemen's port city of Mukalla. Every time they spot a pool of stagnant water, they stop and inspect the puddle. Armed with dippers and sample containers, they are on the hunt for mosquito breeding grounds amid an outbreak of the deadly dengue fever. Makalla has become one of Yemen's worst-hit areas for dengue fever, a viral infection spread by mosquito bites that can cause fevers, headaches, body aches, nausea, and in severe cases, death. Bin Shabz kneels beside an open drainage chamber where a puddle of stagnant water, discharged from a household air conditioner, has turned green after standing f...
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Yemen's health workers race to halt latest outbreak of deadly dengue fever
Mukalla, Yemen - Under the scorching sun and through heady humidity, Salem bin Shabz and his team of health workers move slowly through the narrow alleyways of Al-Koud, a densely populated slum in Yemen's port city of Mukalla. Every time they spot a pool of stagnant water, they stop and inspect the puddle. Armed with dippers and sample containers, they are on the hunt for mosquito breeding grounds amid an outbreak of the deadly dengue fever. Makalla has become one of Yemen's worst-hit areas for dengue fever, a viral infection spread by mosquito bites that can cause fevers, headaches, body aches, nausea, and in severe cases, death. Bin Shabz kneels beside an open drainage chamber where a puddle of stagnant water, discharged from a household air conditioner, has turned green after standing f...
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Yemen reports 30 dengue-related deaths in H1, warns of rainy season surge
ADEN, Yemen, July 8 (Xinhua) -- Yemen recorded more than 5,700 dengue fever cases and 30 related deaths in government-controlled areas during the first half of 2026, health authorities said Wednesday, warning the onset of the rainy season could accelerate the spread of the mosquito-borne disease. Taysir Al-Sami, a health official of the southwestern province of Taiz, said the southern port city of Aden accounted for the highest death toll with 15 fatalities, representing half of all dengue-related deaths logged in the six-month period. He warned that dengue transmission is likely to increase during the rainy season, urging intensified mosquito-control campaigns, stronger disease surveillance, and faster diagnosis and treatment. Yemen has been mired in conflict since late 2014, when Houthi ...
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Yemen reports 30 dengue-related deaths in H1, warns of rainy season surge
ADEN, Yemen, July 8 (Xinhua) -- Yemen recorded more than 5,700 dengue fever cases and 30 related deaths in government-controlled areas during the first half of 2026, health authorities said Wednesday, warning the onset of the rainy season could accelerate the spread of the mosquito-borne disease. Taysir Al-Sami, a health official of the southwestern province of Taiz, said the southern port city of Aden accounted for the highest death toll with 15 fatalities, representing half of all dengue-related deaths logged in the six-month period. He warned that dengue transmission is likely to increase during the rainy season, urging intensified mosquito-control campaigns, stronger disease surveillance, and faster diagnosis and treatment. Yemen has been mired in conflict since late 2014, when Houthi ...
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Dengue, Bangladesh
This event envelope contains reports on dengue in Bangladesh.
Source: BEACON - View Full Report
Dengue, Vanuatu
This event envelope contains reports on Dengue in Vanuatu.
Source: BEACON - View Full Report
Dengue, Colombia
In 2025, Colombia reported 123 745 dengue cases and 118 confirmed deaths, corresponding to a national case fatality rate of 0.09% and an incidence of 370.7 cases per 100 000 inhabitants, substantially lower than in 2024 but still above historical baseline levels. Most cases were non-severe, yet 38% presented with warning signs or severe dengue, with the highest incidence observed among children and adolescents under 17 years, placing pressure on pediatric health services. Dengue transmission showed strong geographic clustering, with 57.4% of cases concentrated in a small number of departments, and a late-year increase in cases signaled continued transmission risk entering 2026.
Source: BEACON - View Full Report
Dengue, Malaysia
This event envelope contains reports on Dengue in Malaysia.
Source: BEACON - View Full Report
Dengue, Brazil
This event envelope contains reports on dengue in Brazil.
Source: BEACON - View Full Report
Dengue, Yemen
This event envelope contains reports on dengue in Yemen.
Source: BEACON - View Full Report
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Expert Resources & References
Trusted information from leading health organizations
CDC
Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources →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: 2026-08-17
Frequently Asked Questions
Common questions about Dengue Fever answered by our epidemiology team
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