This is a webpage maintained by the Centers for Disease Control and Prevention (CDC) on Viral Hemorrhagic Fevers. Viral Hemorrhagic Fevers are filoviruses such as Ebola, Marburg and arenaviruses (e.g. Lass, Machupo). Information contained on the website includes fact sheets and overviews, laboratory testing procedures, surveillance and investigation, and infection control. Several documents are available in portable document format (pdf).