- Dengue fever and dengue hemorrhagic fever are caused by four serotypes of the dengue virus and transmitted by the Aedes aegypti mosquito. Dengue fever causes flu-like symptoms while dengue hemorrhagic fever can be severe and fatal. - Diagnosis of dengue hemorrhagic fever requires fever, hemorrhagic manifestations, thrombocytopenia, and evidence of plasma leakage. Secondary infection with a different serotype is a risk factor due to antibody-dependent enhancement of infection. - Treatment involves supportive care and fluid replacement for dengue fever, while dengue hemorrhagic fever requires close monitoring, intravenous fluids, blood transfusions, and intensive supportive