http://www.cdc.gov/ncidod/dvrd/spb/index.htm

Home page on the Centers for Diseases Control and Prevents - CDC web site. The Special Pathogens Branch works with Biosafety Level 4 (BSL-4) viruses. These viruses are highly pathogenic and require handling in special laboratory facilities designed to contain themThe home page supplies general and technical information about viral hemorrhagic fevers (VHFs), such as Ebola hemorrhagic fever, Rift Valley fever, Lassa fever, and others, such us Hantavirus pulmonary syndrome, Lymphocytic choriomeningitis (LCMV), Marburg hemorrhagic fever and Nipah virus encephalitis and others