Pathophysiology of dengue hemorrhagic fever, what is this?

Dengue Fever: Hemorrhagic fever is the most serious manifestation of dengue fever. It can lead to circulatory failure and shock. In it there's a plasma leakage syndrome with increased vascular permeability, platelet count less than 100, 000, fever lasing 2-7 days, and spontaneous bleeding with microvascular fragility. There may be small bruises (petechiae) in the skin all the way to profuse bleeding.