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What is Dengue Fever?

Dengue Fever Facts, Symptoms, Treatment, and How to Avoid the Mosquitoes.


Avoiding mosquito bites

The deadliest creature on Earth preparing to bite.

Photo by Alvesgaspar / Creative Commons

Now endemic throughout Asia, Africa, and Latin America, dengue fever is a leading cause for death and hospitalization of children in tropical and sub-tropical countries. Dengue has risen dramatically in the last decade, even making appearances in the US and Europe. The World Health Organization estimates that around half of the world's population is now at risk and that there are between 50 - 100 million dengue infections each year.

As a traveler in Asia, particularly Southeast Asia, you are at risk for contracting dengue fever.

What is Dengue Fever?

First understand:

  • Dengue fever is typically spread through daytime mosquito bites.
  • There is currently no vaccination to prevent dengue fever.
  • Dengue is typically not fatal, however, you could be hospitalized or sick for weeks.
  • Dengue fever is much more risky the second time you contract it.
  • Although you'll hear several variants for pronouncing dengue fever, the correct way sounds like 'den-gay'.

Dengue fever, also known as breakbone fever, is a mosquito-borne illness caused by bites from the Aedes aegypti mosquito. When an infected mosquito bites someone whom is already suffering from dengue fever, she carries the virus on to her next victim.

Dengue fever is not transmitted from human to human, however, one mosquito can infect many people within her life cycle. You are more at risk for contracting dengue when other people infected with dengue are present. Blood transfusions have been known to spread dengue in rare instances.

Although typically not fatal, dengue fever can put you out of commission for a month or longer, certainly putting a damper on your visit to Asia!

How to Limit Your Risk

Only female mosquitoes from the genus Aedes can transmit dengue fever. The main culprit is the Aedes aegypti mosquito or 'tiger mosquito' which is larger than other mosquitoes and has white spots/markings. These mosquitoes mostly breed in man-made containers (e.g., empty flower pots and buckets) in urban environments. The aedes aegypti mosquito prefers to feed off of humans and thrives where there are human settlements rather than in the jungles.

Unlike the mosquitoes which transmit malaria, dengue-infected mosquitoes typically bite during the day. Protecting yourself from bites in the early morning and late evening just before dusk is essential to avoid potential exposure to dengue fever.

Symptoms of Dengue Fever

The first symptoms of dengue fever start to appear from 4 - 10 days after a bite from an infected mosquito.

As with many viruses, early symptoms of dengue fever begin with flu-like aches and pains -- particularly in the joints -- with a severe headache and high fever (104 degrees Fahrenheit / 40 degrees Celsius). The aches and pains are usually followed by swollen glands, nausea, and vomiting. Even when dengue doesn't turn severe, it can produce fatigue for weeks after exposure.

Signs that dengue fever has produced complications and may have become potentially life threatening include: severe abdominal pain, vomiting blood, bleeding from mucous membranes, and rapid/shallow breathing. People with asthma and diabetes are at a higher risk for developing dangerous complications from dengue.

Around half a million people require hospitalization from severe dengue each year and about 2.5% of those cases prove fatal. Young children in developing countries are most often the victims of dengue fever.

If you are unlucky enough to get dengue fever a second time, you have a much higher risk for complications and dangerous health implications.

Dengue Fever Treatment

Unfortunately, there is no official or sure-fire way to treat dengue fever; you simply have to ride it out over time. Treatment includes basics such as giving over-the-counter medications to control fever, fluids to stop dehydration, and close monitoring to ensure the virus does not cause hemorrhaging.

Dengue Fever in Thailand and Southeast Asia

Dengue hemorrhagic fever first made an appearance in Thailand and the Philippines during the 1950s. Only nine countries were thought to have dengue epidemics before 1970. Today, dengue is considered endemic in more than 100 countries with Southeast Asia being the worst affected region.

Unlike Japanese encephalitis and malaria, you have more risk for for contracting dengue fever in urban areas such as Pai and Chiang Mai, although dengue is also a real problem in the Thai islands. Places such as Railay, Thailand, have plenty of porous rocks and wet areas where mosquitoes can breed uninhibited.

Dengue Fever in the United States

Much of the Southeast United States is now at risk for dengue fever; 24 cases were reported in Florida during a 2010 outbreak. Dengue has also been prevalent in Oklahoma and along the border with Mexico in southern parts of Texas.

Climate change has been blamed for the jump in dengue cases as well as the mosquitoes' ability to adapt. Some varieties of the Aedes aegypti mosquito have adapted to the cooler climates found in Europe and the US.

  • See what the World Health Organization says about dengue fever.

The Dengue Fever Vaccination

Researchers at Chiang Mai University in Thailand -- one of the worst-affected countries -- made a breakthrough in 2011 on what could become the world's first dengue fever vaccination.

Although developing a live attenuated vaccine against dengue in the laboratory was a giant step forward, getting the vaccination tested, approved, and to market is estimated to take at least another decade.

Despite the fact that there is no vaccination -- yet -- against dengue fever, you should take advantage of the vaccinations that are available before leaving home. Learn more about travel vaccinations for Asia.

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