<prompt> Which of the following statement s isare true about dengue fever -HematocritIncrease in PlateletNegative tourniquet testVector Aedes aegypticus usually bites in night time  <response>: In dengue fever , hematicrit increases, platelet decreases, positive tourniquet test ,vector usually bite in day time. Reference:Park;s textbook of preventive and social medicine,K.Park,23rd edition,page no:236-255. p 