NEW YORK (REUTERS) - An American nurse who was exposed to Ebola while volunteering in an Ebola treatment unit in Sierra Leone will be admitted to the National Institutes of Health's Clinical Centre in Maryland on Thursday, NIH announced.

The centre is one of 35 designated as an Ebola treatment center earlier this month by the US government, and previously treated a nurse who contracted Ebola in Texas.

NIH did not release any further information on the nurse, including when he or she might have been exposed to the virus, current medical condition or affiliation.

The patient will be admitted "for observation and to enroll in a clinical protocol," NIH said in a statement.

The clinical studies unit is designed to provide high-level isolation capabilities and is staffed by infectious disease and critical care specialists.