An American clinician has been cured of Ebola and was discharged from a hospital near the US capital, officials said Thursday.

The man, whose identity has not been revealed, was sickened with the often while working in Sierra Leone, and was flown to the United States for treatment last month.

"We're heartened by the news that our colleague is heading home, free of Ebola, and making his way toward a full recovery," said Sheila Davis, chief of Ebola response for Partners In Health, the medical charity that employed him in west Africa, which is facing the deadliest outbreak of Ebola in history.

"His commitment to strengthening the quality of health care in some of the world's poorest communities is something we should all be proud of."

The man was admitted to the National Institutes of Health Clinical Center in Bethesda, Maryland on March 13.

"The individual is no longer contagious to the community," the NIH said in a statement, noting that he had been released earlier Thursday.

"At the request of the patient, no further information is being provided."