<prompt>  Dengue haemorrhagic fever is diagnosed by-Acute onset of high fever, presence of petechiae, epistaxis and platelet count 2 lakhAcute onset of high fever, positive tourniquest test, epistaxis or malena and malena and platelet count 1.5 lakhAcute onset of high fever 2 to 7 days, associated with hemorrhagic manifestation e.g. hemoptysis and platelet count less than 1.5 lakhAcute onset of high fever, positive tourniquet test, bleeding gum and platelet count less than 1.0 lakh 