An American doctor who was exposed to Ebola while volunteering in Sierra Leone has tested negative for the virus at the National Institutes of Health near the nation's capital.
The patient, who was not identified, arrived at NIH's Clinical Center Sept. 28 and was tested for the virus in an "abundance of caution."
Four other American aid workers who were sickened by Ebola while volunteering in the West African outbreak have been treated at hospitals in Georgia and Nebraska. One remains hospitalized while the others have recovered.
