How Many People Die From Dengue Every Year?

Picture an apartment block in São Paulo in late summer. The rain has stopped, and in the gutters, plant pots and an old tyre on a balcony, small pools of still water are warming in the sun. Within a week, each one is alive with mosquito larvae. Within two, the adult mosquitoes are biting, mostly in daylight, mostly around ankles, mostly unnoticed.

A few days later, a teenager on the fourth floor wakes up with a crushing headache and a fever of 40°C. Her joints ache so badly that people used to call this illness "breakbone fever". Her family assumes it is flu. On day five, just as the fever drops and she seems to be recovering, she starts vomiting, her gums bleed, and her stomach is suddenly very painful. That is the dangerous moment. With prompt hospital care she will almost certainly survive. Without it, she might not.

Dengue is usually a miserable week in bed. Occasionally, it kills. And in 2024 it did so on a scale the world had never recorded before.

The headline number

According to the World Health Organization, a record 14.6 million dengue cases were reported in 2024, along with more than 12,000 dengue-related deaths. That was the highest burden ever recorded.

Time period	Reported dengue deaths, 2024 (approx.)
Per year	12,000
Per month	1,000
Per week	230
Per day	33
Per hour	1.4

Reported deaths are only part of the story. Many cases are never tested, and many deaths in poorer countries are never attributed to dengue. The Global Burden of Disease study, which models deaths rather than counting reports, estimated about 29,000 dengue deaths in 2021, more than double the number reported that year. The true annual toll probably lies somewhere between the reported and modelled figures.

Measure	Figure	Source
Reported cases, 2024	14.6 million	WHO
Reported deaths, 2024	more than 12,000	WHO
Modelled deaths, 2021	about 29,000	Global Burden of Disease
Estimated infections per year	100 to 400 million	WHO
Share of world population at risk	about half	WHO
Countries where dengue is endemic	more than 100	WHO

To put this in context, around 170,000 people die every day from all causes, which you can watch on our live death counter. Dengue is a small slice of that, far smaller than malaria, which kills around 1,640 people a day. What makes dengue alarming is not its current death toll, but how fast it is growing.

Twenty-nine times more cases than in 2000

In 2000, countries reported about half a million dengue cases to WHO. By 2024, that had risen nearly thirtyfold.

Year	Reported cases worldwide (approx.)
2000	505,000
2019	5.2 million (then a record)
2023	6.5 million
2024	14.6 million (record)

Part of that rise is better testing and reporting. But most experts agree that the real spread of the disease has accelerated too. The Aedes mosquitoes that carry dengue thrive in warm, wet, crowded places, and the world is becoming all three.

Early figures for 2025 were well below 2024's peak. By early December 2025, the European Centre for Disease Prevention and Control counted over 5 million cases and over 3,000 deaths across more than 100 countries, partial-year data that may still rise. Dengue comes in waves, and a quieter year often follows a huge one, because so many people have recently been infected.

Where dengue strikes

In 2024, the Americas accounted for more than 13 million of the 14.6 million reported cases. Brazil had by far the worst year in its history, with more than 6,000 deaths. Argentina, Mexico, Colombia and Peru also saw major outbreaks. You can explore the region on our Americas page and our Brazil page.

Region	Dengue picture
Americas	Over 90% of reported cases in 2024; record epidemics in Brazil and Argentina
South and Southeast Asia	Long-standing heartland; huge numbers of untested cases; deadly outbreaks in Bangladesh
Africa	Likely heavily under-reported; outbreaks in Burkina Faso and elsewhere
Pacific	Repeated outbreaks across island nations
Europe	Small but growing numbers of locally caught cases in France, Italy and Spain

Asia is where most of the world's dengue infections have historically happened, and the reported figures probably understate it badly. Bangladesh suffered its deadliest dengue year on record in 2023, with more than 1,700 deaths. You can see the wider regional picture on our Asia page.

Europe is the newest frontier. In 2024, there were 308 locally acquired dengue cases in France, Italy and Spain, carried by the Asian tiger mosquito (Aedes albopictus), which has spread steadily north over the past two decades. French overseas territories, Réunion and Mayotte, recorded 1,291 cases and four deaths in the same year.

Why the second infection is the dangerous one

Dengue has four different types, or serotypes. Catching one gives you lasting immunity against that type, but not the others. This is where dengue becomes unusual, and dangerous.

Infection	What usually happens
First infection	Often mild or no symptoms at all; sometimes a high fever and severe aches for a week
Second infection (different type)	Higher risk of severe dengue, as antibodies from the first infection can help the new virus enter cells
Severe dengue	Plasma leakage, bleeding, organ damage and shock, usually around days 3 to 7
With good hospital care	Most patients with severe dengue survive

WHO notes that previous dengue infection increases the risk of severe dengue. That is why countries where all four types circulate, and where most adults have already had one infection, can see sudden spikes in deaths during big epidemics.

The danger sign many families miss is that severe dengue often arrives just as the fever falls. Warning signs include severe stomach pain, persistent vomiting, bleeding gums or nose, rapid breathing, restlessness, and blood in vomit or stools. Anyone with those symptoms needs urgent medical care. There is no specific antiviral for dengue, but careful fluid management in hospital saves lives.

Children are particularly vulnerable in parts of Asia, where dengue is a major cause of hospital admissions among school-age children. You can see how children's causes of death differ by age on our ages 5 to 14 page.

Why dengue is spreading

Driver	Why it matters
Warmer temperatures	Mosquitoes breed faster and the virus develops faster inside them
Heavier rains and flooding	More standing water for breeding
Rapid urban growth	Crowded cities with poor drainage are ideal habitat for Aedes aegypti
Water storage	Tanks, buckets and drums in homes without piped water become breeding sites
Travel and trade	Infected people and mosquito eggs move across the world quickly
Spread of the tiger mosquito	Brings dengue risk to cooler regions, including Europe

Climate is a common thread here, as it is in many of the trends we track, from heatwave deaths to waterborne disease, covered on our water-related diseases page. The mosquitoes themselves are among the deadliest animals on earth, as we explain in the deadliest animals in the world.

Fighting back: bacteria, vaccines and old-fashioned cleanup

There is real good news in the dengue story. Two new tools are changing what is possible.

Wolbachia mosquitoes. Wolbachia is a common bacterium that, when introduced into Aedes aegypti mosquitoes, makes them much worse at transmitting dengue. The mosquitoes are released and gradually replace the local population. In a landmark randomised trial in Yogyakarta, Indonesia, published in the New England Journal of Medicine, dengue cases fell by 77% and hospitalisations by 86% in treated areas. Brazil has now built what it describes as the world's largest Wolbachia mosquito factory, able to produce millions of mosquitoes a week.

Vaccines. The vaccine Qdenga (also known as TAK-003) is licensed in a number of countries, and WHO recommends it for children aged 6 to 16 in high-transmission settings. In 2025, Brazil's regulator approved Butantan-DV, a single-dose vaccine developed by the Butantan Institute, initially for people aged 12 to 59, with trial efficacy of about 80% against symptomatic dengue over two years. Earlier vaccines came with a serious catch: they could raise the risk of severe disease in people who had never been infected, which is why testing and age limits matter.

Tool	Status	Headline result
Wolbachia mosquito releases	Scaling up in Indonesia, Brazil, Colombia and elsewhere	77% fewer cases, 86% fewer hospitalisations (Yogyakarta trial)
Qdenga (TAK-003)	Licensed in several countries	WHO-recommended for ages 6 to 16 in high-transmission areas
Butantan-DV	Approved in Brazil, 2025	About 80% efficacy over two years, single dose
Removing standing water	Proven, cheap, low-tech	Cuts breeding sites at home and in communities
Early hospital care	Standard practice	Keeps death rates low even in big epidemics

The simplest measure is still the most powerful: empty, cover or throw away anything that holds water. Flowerpot saucers, buckets, gutters, old tyres and water tanks are where the problem begins.

If you are travelling

Dengue is now one of the most common causes of fever in travellers returning from the tropics. Use insect repellent during the day as well as at dusk, since Aedes mosquitoes bite in daylight. Wear long sleeves where you can, and seek medical advice if you develop a high fever within two weeks of returning. Avoid anti-inflammatory painkillers such as ibuprofen and aspirin if dengue is possible, because they can increase bleeding risk; paracetamol is the usual choice, but follow medical advice.

For comparison with other diseases that travellers and poorer communities face, see our guides to how many people die from malaria every day, rabies and cholera.

The bottom line

Dengue kills far fewer people than malaria, tuberculosis or heart disease. But it has grown faster than almost any other infectious disease over the past quarter-century, and it is moving into places that have never had to think about it. The record year of 2024 may be a warning of what a warmer, more crowded world looks like. The new vaccines and Wolbachia mosquitoes give real reason for hope, if they can be rolled out fast enough.

While you were reading

In the eleven minutes it took to read this article, roughly 1,300 people died around the world from all causes. On 2024's reported figures, dengue claims a life roughly every 45 minutes, and somewhere a family is watching a fever fall and hoping it means recovery. You can watch the global count rising in real time or see today's running total.

Sources: World Health Organization, Dengue and severe dengue fact sheet and Dengue global situation 2024 update (Weekly Epidemiological Record); Global Burden of Disease Study 2021 (IHME); European Centre for Disease Prevention and Control, dengue worldwide overview 2025; World Mosquito Program and Utarini et al., New England Journal of Medicine 2021; Butantan Institute and ANVISA, 2025. Reported dengue deaths are known to undercount the true toll; figures are approximate. This article is general information, not medical advice. Seek urgent medical help for any dengue warning signs.