This document summarizes information about Dengue fever. It discusses the background and history of Dengue fever, modes of transmission, clinical presentation, treatment and statistics from King Fahd Hospital in Jeddah. Key points include that Dengue virus causes about 100 million cases annually worldwide, it is transmitted by mosquitos Aedes aegypti and Aedes albopictus, symptoms include rash, bleeding, leukopenia and thrombocytopenia, and there is no vaccine so treatment is supportive. The hospital statistics show that most patients were ages 21-34, more were male than female, 72% tested positive for IgM antibodies, and Saudi patients comprised 51% of positive IgM cases.