The condition of a US healthcare worker who was infected with Ebola in Sierra Leone has worsened and is now critical, hospital officials said.
The medical charity, Partners in Health, said the patient is a clinician who worked in the west African country, which along with Liberia and Guinea is struggling to emerge from the worst Ebola outbreak in history.
The patient was airlifted from Sierra Leone and was admitted to the National Institutes of Health Clinical Center in Maryland on Friday.
"NIH physicians have changed the status of the patient with Ebola virus disease being treated at the NIH Clinical Center from serious to critical condition," a statement said.
"No additional details about the patient are being shared at this time."
Ten other healthcare workers "who came to the aid of their ailing colleague were subsequently identified as contacts of the evacuated clinician," the charity said.
They are being transported to the United States and are being monitored for signs of illness.
In the UK, a healthworker who had potential contact with the Ebola virus while working in Sierra Leone has been discharged from the Royal Victoria Infirmary in Newcastle following assessment.
Meanwhile doctors in London are continuing to treat a military healthcare worker who tested positive for the deadly virus last week.
The servicewoman was evacuated to the UK by RAF plane on Thursday and is being treated in a high-level isolation unit at the Royal Free Hospital in Hampstead.
No updates have been provided about her condition.
Four colleagues who came into contact with her were also tested for the virus and evacuated from the west African country.
Three were discharged after being assessed at the RFH and Royal Victoria Infirmary, where one remains under observation.
More than 10,000 people have died in the Ebola outbreak, but the epidemic is showing signs of slowing down in recent months.
