Breaking News Emails

Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.
 / Updated  / Source: NBC News

An American health worker being treated for Ebola has improved, the National Institutes of Health said Monday.

“The status of the patient with Ebola virus disease being treated at the NIH Clinical Center has improved from serious to fair condition,” NIH said in a statement. “No additional details about the patient are being shared at this time.”

The patient is one of 17 staffers working for the non-profit Partners in Health evacuated from Sierra Leone earlier this month.

The other 16 Partners in Health staffers were evacuated after a Centers for Disease Control and Prevention investigation showed they'd had a risky exposure either to the U.S. patient or to a Sierra Leonean doctor at the clinic who was also infected. The 16 U.S. staffers are under a 21-day watch to make sure they don't develop symptoms. They're all close to clinics where they could be treated quickly if they do.

Ebola's infected 25,000 people in West Africa and killed more than 10,000 of them.

IN-DEPTH:

-- Maggie Fox