Dengue Fever: Understanding the Illness and Its Impact Dengue fever is an acute infectious disease caused by the dengue virus, transmitted to humans through the bite of infected Aedes mosquitoes. The condition presents in varying degrees of severity, from typical dengue fever to mild and severe forms. Symptoms can range from fever and general toxic symptoms. Fever Individuals experience sudden high fever, with body temperatures reaching up to 39-40°C, usually lasting for 5-7 days. In some cases, a biphasic fever pattern may occur, where the temperature drops and then rises again. General Toxic Symptoms Headaches: Particularly pain behind the eyes... Learn more