An American health worker who contracted the Ebola virus while volunteering in Sierra Leone was admitted to the National Institutes of Health Clinical Center in Bethesda on Friday and is in serious condition, NIH officials said.

The person is the second Ebola patient treated in the hospital's Special Clinical Studies Unit, a facility designed for high-level containment and staffed by infectious disease specialists. Texas nurse Nina Pham was treated there and released in October.

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NIH officials said the patient was admitted at 4:44 a.m. after traveling to Maryland in isolation aboard a private chartered flight. Officials did not release further details about the patient, including the person's name or gender.

Though the Ebola outbreak has waned significantly in Liberia, dozens of new cases continue to be reported each week in Guinea and Sierra Leone. Liberia released its last Ebola patient on March 5, and if no new cases are found within 42 days of that date, the country will be declared Ebola-free, according to World Health Organization standards.

More than 10,000 people have died in the Ebola outbreak, which began in late 2013 and was declared an international health emergency in August 2014, according to WHO.

The Associated Press contributed to this article.

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