An American health worker being treated for Ebola at the National Institutes of Health's Clinical Center in Bethesda has been upgraded from fair to good condition, the NIH said Tuesday.

The health worker, who has not been identified, was admitted to a special isolation unit for patients with contagious diseases at the center last month after contracting the disease while volunteering in an Ebola treatment unit in Sierra Leone.

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Sierra Leone is one of three West African countries — along with Liberia and Guinea — hit hardest by the 2014 Ebola outbreak, which has claimed more than 10,000 lives, according to the Centers for Disease Control and Prevention.

It is the largest Ebola outbreak in history, and cases continue to be identified.

The health worker arrived at the NIH center on March 13 by special transport. Days later, the patient's condition deteriorated from serious to critical, but soon after began improving.

The NIH Clinical Center became a focus of the United States' domestic response to the outbreak after a Texas nurse was transported there Oct. 16 after contracting the disease while treating an infected Liberian man in Dallas.

That nurse, Nina Pham, was released from the NIH facility having been cured of Ebola on October 24. That afternoon, she traveled to Washington and hugged President Barack Obama on camera.

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