The British nurse who contracted Ebola in Sierra Leone has spent the night at the Royal Free hospital in London, where she is undergoing treatment for a third time.
After her initial recovery she fell ill again in October last year and was treated for meningitis caused by Ebola.
Doctors say Pauline Cafferkey has now suffered a "late complication" from the deadly disease.
Virologist, Professor John Oxford is confident she can get better: “Its sometimes, more often than not, the symptoms that come on six months later, not because the virus is still there active, it’s just the effects of the virus damage, a year before.
“So that’s why I am optimistic that good nursing care will pull her through and she will come out of this.”