Dengue (DEN-gee) fever is a tropical disease caused by a virus carried by mosquitoes.
The virus can cause fever, headaches, rashes, and pain throughout the body. Most cases
of dengue fever are mild and go away on their own after about a week.
Dengue fever rarely strikes in the United States — the last reported outbreak
was in Texas in 2005. But if you plan to travel to a foreign country, especially one
in the tropics, it's wise to guard against dengue fever. Wearing insect repellent,
covering sleep areas with netting, and avoiding the outdoors at dusk and dawn (when
mosquitoes are most active) can help lower the chances of infection.
What Causes Dengue Fever?
Dengue fever is caused by four similar viruses spread by mosquitoes of the genus Aedes,
which are common in tropical and subtropical areas worldwide.
When an Aedes mosquito bites a person who has been infected with a dengue
virus, the mosquito can become a carrier of the virus. If this mosquito bites someone
else, that person can be infected with dengue fever. The virus can't spread directly
from person to person.
In rare cases, dengue fever can lead to a more serious form of the disease called
dengue hemorrhagic fever (DHF). DHF can be life-threatening and needs to be treated
What Are the Signs & Symptoms of Dengue Fever?
Symptoms of dengue fever are generally mild in younger children and those who have
the disease for the first time. Older kids, adults, and those who have had a previous
infection may have moderate to severe symptoms.
Common signs and symptoms of dengue fever include:
Dengue fever used to be called "breakbone fever," which might give you an idea
of the severe bone and muscle pain it sometimes can cause. The fever isn't actually
breaking any bones, but it can sometimes feel like it is.
How Long Does Dengue Fever Last?
Symptoms can start anywhere from 4 days to 2 weeks after being bitten by an infected
mosquito, and typically last for 2 to 7 days.
After the fever eases, other symptoms can get worse and may cause more severe bleeding;
gastrointestinal problems like nausea, vomiting, or severe abdominal (belly) pain;
and respiratory problems like difficulty breathing. Dehydration,
heavy bleeding, and a rapid drop in blood pressure (shock) can follow if DHF goes
untreated. These symptoms are life-threatening and need immediate medical care.
Someone who's had the illness becomes immune to that particular type of the virus
(but can still be infected by any of the other three types).
How Is Dengue Fever Diagnosed?
If you think your child might have dengue fever, call a doctor right away. You
should also call a doctor if your child has recently been to a region that has dengue
fever and has a fever or severe headache.
To make a diagnosis, the doctor will examine your child and evaluate the symptoms.
The doctor will ask about your child's medical history and recent travels, and send
a blood sample for testing.
How Is Dengue Fever Treated?
No specific treatment is available for dengue fever. Mild cases are managed with
lots of fluids to prevent dehydration and getting plenty of rest. Pain relievers with
can ease the headaches and pain associated with dengue fever. Pain relievers
with aspirin or ibuprofen should be avoided, as they can make bleeding more likely.
Most cases of dengue fever go away within a week or two and won't cause any lasting
problems. If someone has severe symptoms of the disease, or if symptoms get worse
in the first day or two after the fever goes away, seek immediate medical care. This
could be an indication of DHF, which is a medical emergency.
To treat severe cases of dengue fever at a hospital, doctors will give intravenous
(IV) fluids and electrolytes (salts) to replace those lost through vomiting or diarrhea. When started
early, this is usually enough to effectively treat the disease. In more advanced cases,
doctors may have to do a blood transfusion.
In all cases of dengue infection, efforts should be made to keep the infected person
from being bitten by mosquitoes. This will help prevent the illness from spreading
Can Dengue Fever Be Prevented?
There's no vaccine to prevent dengue fever. The best protection is to prevent bites
by an infected mosquito. Be sure to:
Use screens on doors and windows, and promptly repair broken or damaged screens.
Keep unscreened doors and windows shut.
Have kids wear long-sleeved shirts, long pants, shoes, and socks when they go
outside, and use mosquito netting over their beds at night.
Use insect repellent as directed on kids. Choose one with DEET
or oil of lemon eucalyptus.
Limit the amount of time kids spend outside during the day, especially in the
hours around dawn and dusk, when mosquitoes are most active.
Don't give mosquitoes places to breed. They lay their eggs in water, so get rid
of standing water in things like containers and discarded tires, and be sure to change
the water in birdbaths, dog bowls, and flower vases at least once a week.
By taking these precautions and keeping your kids away from areas that have a dengue
fever epidemic, the risk of contracting dengue fever is small for international travelers.