What causes viral hemorrhagic fever?

Viral hemorrhagic fever is an acute infectious disease caused by various specific viruses, and its main causes are as follows: 1. Viral infection: Common pathogens include Flaviviridae (e.g., dengue virus), Bunyaviridae (e.g., Hantavirus, which causes hemorrhagic fever with renal syndrome), and Filoviridae (e.g., Ebola virus). These viruses are transmitted to humans through specific vectors such as mosquitoes, ticks, and rodents. 2. Routes of transmission: Viruses mainly enter the human body through mosquito bites, contact with contaminated objects (e.g., blood or other bodily fluids containing the virus), laboratory exposure, and airborne droplets. For example, dengue hemorrhagic fever is primarily transmitted through bites of Aedes mosquitoes, while hemorrhagic fever with renal syndrome is spread through excretions or saliva of rodents. 3. Susceptible population: Individuals with weakened immune systems, such as the elderly, children, and patients with underlying medical conditions, are more susceptible to viral infection and more likely to develop hemorrhagic fever. If you have any concerns, please consult a relevant healthcare provider.