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Severe,
potentially fatal infection that occurs when someone with
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immunity to one
type of Dengue virus is infected by a different type.
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It is spread by
certain mosquitoes (Aedes aegypti) that bite primarily
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during the day.
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Worldwide, more
than 100 million cases of dengue fever occur every
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year. A small
percent of these develop into Dengue hemorrhagic
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fever. Most cases
in the U.S. are brought in from other countries.
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Risk factors for
Dengue hemorrhagic fever include having antibodies
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to dengue virus
from prior infection and being younger than 12,
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female, or
Caucasian.
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