How can Ebola be treated with a survivor's blood?

Clinical trials to try to find an effective treatment for Ebola patients are to start in West Africa next month.

The medical charity Medicins Sans Frontieres says three of its treatment centres will host three separate research projects.

One of the trials will use the blood of patients who have recovered from the virus.

How do you treat an Ebola patient with the blood of an Ebola survivor?

The BBC's Tulip Mazumdar explains.

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