While outbreaks of Marburg virus are rare, there have been several in recent years across sub-Saharan Africa. It's one of the deadliest viral diseases and can be fatal. Here's what you need to know.

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

In Rwanda, 11 deaths have been reported from this rare but deadly disease. Two people tested negative in Germany this week.