Pauline Cafferkey, a Scottish nurse being treated for complications from Ebola, is now "critically ill" after her condition deteriorated, hospital staff have said.
Ms Cafferkey, 39, was admitted to the isolation unit at the Royal Free Hospital in north west London on Friday after becoming unwell in Glasgow.
A statement from the Royal Free said: "We are sad to announce that Pauline Cafferkey's condition has deteriorated and she is now critically ill.
"She is being treated for Ebola in the high level isolation unit at the Royal Free Hospital."
Ms Cafferkey worked in Sierra Leone until the end of last year. When she came back to the UK, in December, she was diagnosed with the virus and went to treatment in isolation at the Royal Free Hospital, which is a specialist in Ebola and other infectious diseases.
Towards the end of January, the hospital said that she was free from infection and was released.
Health experts have said that the way the disease lives on in tissue could be the reason it has the potential to come back after a patient appears to have recovered.
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