Why Aspirin (as an antipyratic) is contra-indicated in dengue ???

Dengue fever is transmitted by female Aedes Aegypti mosquitoes which acquire the virus while feeding on the blood of an infected person.Dengue occurs in two forms: Dengue fever and dengue haemorrhagic fever.
Dengue fever is marked by the onset of sudden high fever, severe headache and pain behind the eyes, muscles and joints.According to the World Health Organisation, dengue haemorrhagic fever is a potentially deadly complication that is characterised by high fever, often with enlargement of the liver and, in severe cases, circulatory failure.There is no specific treatment for dengue fever but early recognition and symptomatic treatment can save lives.
Use of aspirin during dengue fever is not recommended owing to increased bleeding tendency.Aspirin has an antiplatelet effect by inhibiting the production of thromboxane, which under normal circumstances binds platelet molecules together to create a patch over damage of the walls within blood vessels.