<prompt> All of the following are true about dengue fever except:Elevated hematocritThrombocytosisTransmitted by AedesAlso called as breakbone fever  <response>: Ans: b Thrombocytosis Ref: Harrisons, 16th ed, p. 1164; 17th ed, p. 1230In dengue fever thrombocytosis is not seen, thrombocytopenia is seen.Dengue feverDengue is also known as breakbone feverIncubation period: 2-7 daysIt is transmitted by Aedes aegyptiiSecond infection with a serotype of dengue virus different from that involved in the primary infection leads to dengue hemorrhagic fever.Diagnosis by IgM - ELISACriteria for clinical diagnosis of DHF:1 High grade continuous fever lasting 2- 7 days2 Haemorrhagic manifestations including atleast a positive tourniquet test.3 HepatomegalyLab diagnosis1 Thrombocytopenia 100.000mm3 or less2 Haemoconcentration: Haematocrit increased by 20The first two clinical criteria plus thrombocytopenia and haemoconcentration or a rising haematocrit are sufficient to establish diagnosis of DHF.Dengue shock syndrome DSS1 All the above criteria plusShock manifested by rapid and weak pulse and narrowing of pulse pressure or hypotension with cold clammy skinManagement:Symptomatic and supportiveImportant incubation periodsDengue: 2-7 daysDiphtheria: 2-6 daysPertussis: 7-14 daysTetanus: 6-10 daysMeasles: 10 daysMumps: 2-3 weeks 18 daysRubella: 2-3 weeks 18 daysChicken pox: 14-16 daysJapanese encephalitis: 5-15 daysKyasanur forest disease: 3-8 days 