A British nurse battling Ebola in a London hospital is now in a critical condition, medical staff say.
A statement from the Royal Free Hospital said the health of Pauline Cafferkey, who was diagnosed after travelling back to Glasgow from Sierra Leone, had deteriorated in the last two days.
Ms Cafferkey, who was part of a team of medical volunteers deployed to Africa by the UK Government last month, was being treated using the blood of a recovered patient and an experimental anti-viral drug which had not yet been proven to work.
Meanwhile, a person in Wiltshire with a history of travel to West Africa is being tested for Ebola "as a precautionary measure".
In a statement, Great Western Hospitals NHS Foundation Trust said: "The Trust is awaiting results of a sample, which is being screened for a variety of infectious diseases prevalent in the affected countries, one of which is Ebola.
"As a precaution, the patient is being kept in isolation until blood test results are available."
Earlier this week Dr Michael Jacobs, who has been involved in Ms Cafferkey's treatment, said she had been sitting up and talking and was able to read, eat and drink and had spoken to her family.
However, he revealed the hospital was unable to obtain ZMapp, the drug used to treat fellow British volunteer nurse William Pooley, who recovered, because "there is none in the world at the moment".
A brief statement on the hospital's website said: "The Royal Free London NHS Foundation Trust is sorry to announce that the condition of Pauline Cafferkey has gradually deteriorated over the past two days and is now critical."
Ms Cafferkey, 39, who is from Glasgow and works at Blantyre Health Centre, South Lanarkshire, was diagnosed with the deadly virus after returning to Glasgow from Heathrow after flying to the UK from Sierra Leone via Casablanca in Morocco.
She was transferred to north London on an RAF Hercules plane.
A Public Health England (PHE) spokeswoman confirmed all British-based passengers and crew members on both flights from Heathrow to Glasgow and from Casablanca to Heathrow have been contacted.
She said they had all been "given advice and reassurance" by health officials.
She added that an additional 31 international passengers on the Casablanca to Heathrow flight were being contacted by international public health authorities.
The Moroccan Ministry of Health has also been tracing passengers aboard the Royal Air Maroc flight from Freetown in Sierra Leone to Casablanca as a precautionary measure.
All passengers on that flight were screened before they left Freetown and cleared to travel, as well as on their arrival in Casablanca, PHE said.
Originally posted at 14.45
