On December 29, the 39-year-old Glasgow, Scotland, resident became the first person to be diagnosed with the virus on UK soil shortly after returning from Sierra Leone.
Five days later, the Royal Free Hospital announced her condition had deteriorated to critical.
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As she got treatment there, Save the Children said that it was “doing everything possible” to establish how Cafferkey contracted Ebola and had been conducting a review since she was confirmed as having the virus.
CNN’s Susannah Cullinane and Max Foster contributed to this report.
