The family of the British nurse who is being treated at the Royal Free for the deadly virus Ebola has said she could remain in a “critical condition for some time”.

In a statement released today, Scottish nurse Pauline Cafferkey’s family thanked the staff at the hospital in Hampstead for their “kindness, support and compassion”.

They said: “We would like to thank all our friends, family and the members of the public who have contacted us with support following Pauline’s diagnosis with Ebola. We have been very touched by the kind words.

“Pauline continues to be in a critical condition at the Royal Free Hospital.

“We want to thank all the staff caring for her for their kindness, support and compassion.

“Pauline’s condition could remain the same for some time and we would again ask for her and our privacy to be respected.”

Mrs Cafferkey was transferred to a specialist unit at the Royal Free after being confirmed as having contracted Ebola.

She had volunteered with Save the Children at the Ebola Treatment Centre in Kerry Town, Sierra Leone, before returning to the UK. The charity said it was urgently reviewing its protocols.