Dengue fever is contagious. Dengue fever is an acute insect-borne infectious disease caused by dengue virus, the main means of transmission is mosquito-borne, the main manifestations are prominent fever, pain, rash, lymph node enlargement, severe patients can have shock, hemorrhage, and the death rate of children with severe disease is relatively high. At present, it is mainly symptomatic treatment, through timely treatment, the prognosis is relatively good. Dengue fever is widely distributed in tropical and subtropical areas, the main infectious source of dengue fever is dengue fever patients and hidden infected people, the incidence rate of infants and young children is relatively high, and the vast majority of dengue hemorrhagic shock syndrome cases occur in children. In daily life, we should improve the sanitary environment and eliminate mosquitoes to avoid infection.