( CNN ) The National Institutes of Health said Thursday that it plans to admit to its Maryland hospital an American health care worker with Ebola . The person was volunteering at an Ebola treatment center in Sierra Leone , and will be flown back to the United States on a chartered aircraft and admitted Friday , the NIH said . No other details were immediately available . The patient will be the second with Ebola admitted to the NIH hospital . Nina Pham , a nurse at Texas Health Presbyterian Hospital Dallas , was admitted to NIH in October after she contracted the disease while treating Liberian national Thomas Eric Duncan . Pham recovered and was released free of disease . Duncan died . Nurse who contracted Ebola sues hospital company . NIH is one of only four hospitals in the United States that have biocontainment units and has been practicing for years to treat a highly infectious disease such as Ebola . More than 10,000 people have died in the Ebola outbreak , according to the latest figures from the World Health Organization , mostly in the countries of Guinea , Liberia and Sierra Leone . Ebola is spread by direct contact with the bodily fluids of an infected person . CNN 's Athena Jones contributed to this report .
Liberian being flown from Africa to Maryland hospital ; to arrive Friday . NIH has one of only four U.S. hospital biocontainment units .