Being in tropical and subtropical areas increases your risk of exposure to the virus that causes dengue fever. You have a greater risk of developing dengue fever or a more severe form of the disease if: Your risk of developing severe dengue fever increases if you get dengue fever a second, third or fourth time. This means you can be infected again in the future by one of the other three virus types. Then, when the infected mosquito bites another person, the virus enters that person's bloodstream and causes an infection.Īfter you've recovered from dengue fever, you have long-term immunity to the type of virus that infected you - but not to the other three dengue fever virus types. When a mosquito bites a person infected with a dengue virus, the virus enters the mosquito. The two types of mosquitoes that most often spread the dengue viruses are common both in and around human lodgings. Instead, dengue fever is spread through mosquito bites. You can't get dengue fever from being around an infected person.

If you've been traveling recently and develop a fever and mild symptoms of dengue fever, call your doctor.ĭengue fever is caused by any one of four types of dengue viruses. Warning signs include severe stomach pain, vomiting, difficulty breathing, or blood in your nose, gums, vomit or stools. Seek immediate medical attention if you've recently visited an area in which dengue fever is known to occur, you have had a fever and you develop any of the warning signs. Severe dengue fever is a life-threatening medical emergency. Bleeding under the skin, which might look like bruising.The warning signs usually begin the first day or two after your fever goes away, and may include: Warning signs of severe dengue fever - which is a life-threatening emergency - can develop quickly. This can lead to shock, internal bleeding, organ failure and even death. And the number of clot-forming cells (platelets) in your bloodstream drops. Severe dengue happens when your blood vessels become damaged and leaky. This is called severe dengue, dengue hemorrhagic fever or dengue shock syndrome. In some cases, symptoms worsen and can become life-threatening. When symptoms do occur, they may be mistaken for other illnesses - such as the flu - and usually begin four to 10 days after you are bitten by an infected mosquito.ĭengue fever causes a high fever - 104 F (40 C) - and any of the following signs and symptoms: Many people experience no signs or symptoms of a dengue infection.

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