This electron micrograph depicts a number of Marburg virions responsible for causing Marburg Hemorrhagic Fever. Marburg hemorrhagic fever is caused by a genetically unique zoonotic, i.e., animal-borne, RNA virus of the filovirus family; its recognition led to the creation of this virus family. The Ebola viruses are the only other known members of this virus family.

Picture & text from CDC/PHIL. For more information see Marburg Virus Pictures from CDC