'Severe than Ebola' disease hits Rwanda
Marburg virus has claimed 11 lives in Rwanda
Marburg is from the same family as Ebola -- the Filoviridae (filovirus)
Marburg virus is more severe than Ebola
About half of all those who contract the Marburg virus are unlikely to survive
It can take between two and 21 days for symptoms to show, claims WHO
It causes a haemorrhagic fever, that can damage the walls of blood vessels
Internal bleeding caused by the haemorrhagic fever can claim the patient's life
In severe cases, the patient may die eight or nine days after symptoms start to show
The virus was first identified in 1967 in a town in Germany called Marburg and thus the name