This is an official CDC HEALTH ADVISORY: Potential for Dengue Infection Among Relief Workers Returning from Haiti Summary:

The Centers for Disease Control and Prevention (CDC) has received reports of dengue fever among relief workers returning from Haiti, where the disease is endemic. Symptoms of Dengue FeverDengue fever (DF) is characterized by high fever plus two or more of the following: headache, retro-orbital pain, joint pain, muscle or bone pain, rash, mild hemorrhagic manifestations (e.g., nose or gum bleed, petechiae, or easy bruising), and leukopenia. The incubation period for DF ranges from 3 to 14 days but is typically about one week; therefore, illness may occur while the workers are stationed in Haiti or after they return to the US. Most dengue fever cases are self-limited and can be treated with bed rest, acetaminophen, and oral fluids. A small proportion of patients develop dengue hemorrhagic fever (DHF), which is characterized by presence of resolving fever or a recent history of fever lasting 2–7 days, any hemorrhagic manifestation, thrombocytopenia (platelet count <100,000/mm3), and abnormal vascular permeability evidenced by hemoconcentration, hypoalbuminemia, or abdominal or pleural effusions. DHF can result in circulatory instability or shock, and the risk for these complications may be increased among persons with prior dengue infection. Adequate management of DHF patients generally requires timely hospitalization and judicious administration of intravascular fluids and close monitoring of vital signs and hemodynamic status.