Washington - An American health care worker who contracted Ebola while volunteering in a Sierra Leone treatment unit has been downgraded to critical condition at the National Institutes of Health, doctors said on Monday.
The agency said in a statement that the patient's status was changed from serious condition. He is being treated at the National Institutes of Health's hospital near Washington.
"We are intensively treating the patient," said Dr Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases at NIH. "He's in our special clinical studies unit and, hopefully, that will be able to turn this around and the patient will recover, but it's too early to say."
The patient was flown in isolation from Sierra Leone on a chartered plane last week and arrived early on Friday morning. His name and age have not been released.
Screening of patients
The man is a clinician working with Partners in Health, a Boston-based non-profit organisation. The group has been treating patients in Liberia and Sierra Leone since November.
The latest NIH patient is the 11th person with Ebola to be treated in the US. Two patients in the US have died: a man treated in Dallas after contracting the virus in Africa and a doctor evacuated from Africa to Nebraska when he was already critically ill.
The man in Dallas had contracted the virus in his native Liberia.
He transmitted the disease to two nurses, resulting in widespread concern in the US, with questions raised about emergency department screening of patients, monitoring of ill travellers from Africa and even disputes over the disposal of potentially infectious waste from hospitals.
The World Health Organisation has estimated the virus has killed more than 10 000 people, mostly in the West African nations of Guinea, Liberia and Sierra Leone.
The current outbreak is the largest ever for the disease. While deaths have slowed dramatically in recent months, the virus appears stubbornly entrenched in parts of Guinea and Sierra Leone.
Also read: U.S. healthcare worker with Ebola arrives for treatment
Besides the man at NIH, there are 12 other Partners in Health workers being brought to the United States for monitoring.
One of those being monitored has developed symptoms of Ebola and was being moved to an isolation unit, hospital officials said in a news release on Monday. Nebraska Medical Centre spokesperson Taylor Wilson said the individual developed symptoms on Sunday evening and was hospitalised as a precaution. Wilson declined to describe the symptoms, but said they had resolved on Monday.
None of those being monitored has tested positive for Ebola.
The National Institutes of Health said it has no other pending admissions of additional patients with the Ebola virus or who have been exposed to Ebola.
CDC workers in Sierra Leone are involved in investigating the illness of the first patient, including looking for other people the person was in contact with. It's possible other people will be transported to the United States for monitoring, said the spokesperson, Tom Skinner.