You have a greater risk of developing dengue fever or a more severe form of the disease if:
• You live or travel in tropical areas: Being in tropical and subtropical areas increases your risk of exposure to the virus that causes dengue fever. Especially high-risk areas include Southeast Asia, the western Pacific islands, Latin America and Africa.
• You have had dengue fever in the past: Previous infection with a dengue fever virus increases your risk of severe symptoms if you get dengue fever again.
Severe dengue fever can cause internal bleeding and organ damage. Blood pressure can drop to dangerous levels, causing shock. In some cases, severe dengue fever can lead to death.
Women who get dengue fever during pregnancy may be able to spread the virus to the baby during childbirth. Additionally, babies of women who get dengue fever during pregnancy have a higher risk of pre-term birth, low birth weight or fetal distress.
Courtesy: Mayo Clinic