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Dengue Fever (cont.)

Is Dengue Fever Contagious?

Dengue fever is not contagious; it is not spread from person to person. Dengue fever viruses require a vector, a mosquito (see Causes section below), that allows the virus to mature within the mosquito before the mosquito can effectively transfer the viruses to humans during a blood meal.

How Long Is the Incubation Period, and How Long Does Dengue Fever Last?

Symptoms of infection usually start about four to 15 days (the incubation period is typically four to seven days) after a mosquito bite transfers the viruses to the human. In most instances, the disease lasts about three to 10 days, although a few patients' symptoms may last longer. During the incubation period, large amounts of the virus are present in the person's blood just before the person becomes symptomatic; this is when a mosquito that may be uninfected can pick up viruses that can be transferred to other humans. However, the virus has to develop within the mosquito for a few days before it is ready to be transferred during the blood meal (mosquito bite).

Medically Reviewed by a Doctor on 9/21/2015

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