Pauline Cafferkey, 39, of Glasgow is the first person to have been diagnosed with the virus on UK soil.
The Royal Free Hospital said her condition “has gradually deteriorated over the past two days and is now critical.”
The hospital said Wednesday that Cafferkey had decided to have blood plasma treatment — using plasma from Ebola survivors — and to take an experimental antiviral drug.
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There have been more than 20,000 confirmed, probable and suspected cases in Sierra Leone, Guinea and Liberia, the WHO said.
