<prompt> Dengue hemorrhagic fever is caused by -Type I dengue virusReinfection with same serotype of dengue virusReinfection with different serotype of dengue virusInfection in an immunocompromised host  <response>: Hypersensitivity or enhancement response to sequintial dengue virus infection in person sensitised by prior exposure to other serotupes of the viru REF:p ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.523 