A serious condition caused by dengue virus infection. Patients present with an acute febrile illness followed by restlessness, irritability, and bleeding. It may lead to hemorrhagic shock and death.
A virulent form of dengue characterized by thrombocytopenia and an increase in vascular permeability grades i and ii) and distinguished by a positive pain test e.g., tourniquet pain test). When accompanied by shock grades iii and iv), it is called dengue shock syndrome.