<prompt> Pathological changes occur in dengue haemorrhagic Fever DHF:Focal haemorrhages and congestion.Coagulopathy with thrombocytopenia.Haemoconcentration.All of the above.  <response>: PATHOLOGIC CHANGES The predominant organ Changes in DHF are due to:Focal haemorrhages and congestion;Increased vascular permeability resulting in oedema in different organs;Coagulopathy with thrombocytopenia; andHaemoconcentration. 