Dengue hemorrhagic fever is a severe manifestation of dengue virus. It can cause increased permeability of the vessels and resultant bleeding issues. The risk factors of developing dengue hemorrhagic fever are: - obesity - comorbidities e.g., hemolytic disease, cardiovascular or renal disorders - age < 2 years - use of corticosteroids Reference: https://www.cmijournal.org/article.asp?issn=0973-4651;year=2017;volume=15;issue=2;spage=95;epage=105;aulast=Rose Image via: https://www.cmijournal.org/article.asp?issn=0973-4651;year=2017;volume=15;issue=2;spage=95;epage=105;aulast=Rose