While outbreaks of Marburg virus are rare, there have been several in recent years across sub-Saharan Africa. Like many diseases, MRV's name derives from when the disease was first reported in western countries,

Marburg virus disease has killed 11 people and sickened 25 others in Rwanda, which declared an outbreak on Sept. 27.

The East African country continues to investigate the source of the outbreak, first traced among patients in health facilities.