Dengue is spread by humans by female Aedes mosquitoes. These mosquitoes carry the dengue virus (DEN), which consists of four different serotypes (DEN-1, DEN-2, DEN-3 and DEN-4) and belongs to the flaviviridae family. A dengue mosquito usually bites during the day or before evening.
The dengue virus-infected patient starts showing symptoms within 3 to 14 days. The first symptoms include high fever followed by body pain. Fever may occur frequently with severe sweating and headache. Some patients also experience pain behind the eyes, which is medically known as retro-orbital pain. Nausea, vomiting, fatigue, rashes on face and limbs, mild bleeding and low blood pressure are other symptoms of dengue. In acute cases, decreased urine output and breathlessness may also disturb patients.
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