Causes and symptoms of dengue fever, how to protect yourself

By Rajeshwaari Kalla | July 24, 2025 |  Image: Canva

Arthropod-borne viral illness

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Dengue is the most common viral infection in humans in the world that is transmitted by an arthropod which results in a febrile illness

Viremic stage in humans

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Humans are the main host for the dengue virus and are infective during the first three days of the illness. This is known as the viremic stage

Infectivity in mosquitoes

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Mosquitoes become infective and  stay so for the remainder of their  life about two weeks after feeding  on an infected person

Vector of dengue

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The mosquito responsible for the transmission of the dengue virus is known as Aedes aegypti and it is known to breed in stagnant water

Severity classification

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Dengue may be non-severe with or without warning signs, or it may be severe. If adequate attention is not paid, non-severe may turn into severe dengue

Symptoms of non-severe dengue

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Non-severe dengue may be suspected in individuals who have travelled to an endemic area or who present with nausea, vomiting or rashes

Warning signs to watch for

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Warning signs like abdominal pain, tenderness, vomiting that persists, lethargy or restlessness and enlargement of the liver should not be ignored

Features of severe dengue

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In case of severe dengue, excessive plasma leakage can lead to shock, respiratory distress, severe bleeding and changes in the levels of the liver enzymes

Laboratory tests

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Laboratory tests like a complete  blood count, liver function tests, blood glucose, serum electrolytes and renal function tests must be done

Preventive measures

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Most importantly, avoid stagnation of water in or around your place. Prevent collection of water in containers and clean water-based air coolers regularly

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