Dengue
Dengue is the world's most common mosquito-borne viral disease; getting infected more than once raises the risk of a severe, sometimes life-threatening case.
Snapshot: 9/21/2026, 3:30:49 PM · 2 tracked locations · 207,609 active cases (dataset)
At a glance
Quick facts
- How it spreads
- Aedes mosquitoes transmit dengue viruses; vertical transmission and blood products are secondary concerns.
- How serious
- About 0.1 of every 100 confirmed cases died
- Where it's active
- Highest current burden: Bangladesh (BD) and Brazil (BR).
- Vaccine / treatment
- Vector control, community cleanup campaigns, Wolbachia programs where deployed, and cautious fluid management in hospitals.
Important
Virus Tracker provides aggregated outbreak monitoring for education and situational awareness. It is not medical advice, a diagnostic service, or a substitute for guidance from qualified health professionals or official public health agencies. Always consult licensed clinicians and authoritative sources for personal health decisions.
Overview
Four serotypes circulate, enabling sequential infections that shape population immunity profiles. Urbanization and vector expansion widen the at-risk map. Virus Tracker highlights active-case heat and trajectory proxies to support seasonal preparedness.
Transmission
Aedes mosquitoes transmit dengue viruses; vertical transmission and blood products are secondary concerns.
Symptoms & clinical notes
Classic dengue fever with pain behind the eyes, rash, and leukopenia; warning signs herald plasma leakage in severe dengue.
Prevention & control
Vector control, community cleanup campaigns, Wolbachia programs where deployed, and cautious fluid management in hospitals. Vaccines exist in select jurisdictions with specific eligibility rules.
Surveillance context
Entomological indices and case notification together guide outbreak classification. Serotype data informs epidemic forecasting.
Live dataset
Key metrics
Active cases
207.6K
Deaths
2K
How fast it's spreading
8.2%
RisingDengue — global infection heat map
Country shading reflects relative active-case intensity from the current Virus Tracker dataset for this pathogen. Hover countries on desktop for counts.
Darker red = more people currently sick.
Live dataset
Trajectory outlook
Projected case trend with a modeled confidence range.
Projected case trajectory for Dengue, with a shaded confidence range, based on the current Virus Tracker dataset.
Illustrative estimateLive dataset
Top regions by active cases
The 2 tracked locations with the most active Dengue cases in the current dataset.
Top 2 tracked locations for Dengue by active cases, ranked highest to lowest.
Live dataset
Threat intelligence visuals
Threat matrix
How fast vs. how deadly
Each bubble is a threat. Bigger bubbles mean more people are currently sick.
Where this data comes from
11 of 15 sources are reporting normally.
- 11 healthy sourcesHealthy
- 4 sources downDown
- Data reliability
- 41%
- Confidence-adjusted exposure
- 85.5K
Overall threat level
Where it's hitting hardest
- Brazil86.9K active · score 23.2
- Bangladesh120.8K active · score 23.0
Dataset
Top affected regions
| Location | Active | Deaths | Trend |
|---|---|---|---|
| Bangladesh (BD) | 120,758 | 1,250 | Stable |
| Brazil (BR) | 86,851 | 702 | Stable |
Frequently asked questions
How do people catch dengue?
Through the bite of an infected Aedes mosquito, typically one that bites during daylight hours in and around homes.
Is there a vaccine for dengue?
Yes, dengue vaccines exist in some countries, but eligibility is often restricted to people with a prior confirmed dengue infection. Check local guidance before seeking one.
What are the warning signs of severe dengue?
Persistent vomiting, severe abdominal pain, bleeding gums, and difficulty breathing warrant urgent medical care, especially as fever starts to break.
Is this page medical advice?
Virus Tracker provides aggregated outbreak monitoring for education and situational awareness. It is not medical advice, a diagnostic service, or a substitute for guidance from qualified health professionals or official public health agencies. Always consult licensed clinicians and authoritative sources for personal health decisions.
What does "outbreak activity" mean on Virus Tracker?
Outbreak activity reflects active-case burden relative to recoveries in our models. It helps compare stressed outbreak zones within the dataset—it is not a clinical score.
How often is this wiki updated?
Figures refresh on the site’s ingestion and revalidation schedule (typically about every 30 minutes in production). Timestamps on the dashboard snapshot indicate the last build of the underlying dataset.
Why might the heat map not match official government totals?
We merge multiple open sources and fallbacks; reporting lag, testing policy, and geographic coverage differ by country. Use national health ministries for authoritative case definitions.
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