<prompt> All of the following features are seen in dengue hemorrhagic fever except: September 2010Positive tourniquet testPlatelet counts less than 1 lacFalling hematocrit valueAcute onset of high fever  <response>: Ans. C: Falling hematocrit value The diagnosis of dengue is usually made clinically. The classic picture is high fever with no localising source of infection, a rash with thrombocytopenia and relative leukopenia- low paltelet and WBC count. Dengue infection can affect many organs and thus may present unusually as liver dysfunction, renal impairment, meningoencephalitis or gastroenteritis. Fever, headaches, eye pain, severe dizziness and loss of appetite. Hemorrhagic tendency positive tourniquet test, spontaneous bruising, bleeding from mucosa, gingiva, injection sites, etc.; vomiting blood, or bloody diarrhoea Thrombocytopenia 3or estimated as less than 3 platelets per high power field Evidence of plasma leakage Hematocrit more than 20 higher than expected, or drop in hematocrit of 20 or more from baseline following IV fluid, pleural effusion, ascites, hypoproteinemia Encephalitic occurrences 