Nurse Amber Vinson, infected with Ebola by a man she was treating at a hospital in Dallas, is free of the virus, Emory University Hospital said Friday.

Emory and the U.S. Centers for Disease Control and Prevention said in a news release that Vinson, 29, "is is making good progress in her treatment for Ebola virus infection. Tests no longer detect virus in her blood."

Vinson remains in the Serious Communicable Diseases Unit -- a specialized isolation unit -- at Emory for "continued supportive care," the release said, noting that the hospital does not yet have a discharge date for Vinson.

She remains within Emory's Serious Communicable Diseases Unit for continued supportive care. We do not have a discharge date at this time.

The news comes as the second nurse who contracted Ebola at Texas Health Presbyterian Hospital, Nina Pham, was declared free of the virus and released from the hospital.

Vinson and Pham were diagnosed with Ebola after they treated the so-called "index patient" Thomas Eric Duncan, who later died at the hospital.

Both nurses were airlifted to hospitals with special units for treating patients with serious communicable diseases -- Vinson to Emory in Atlanta and Pham to the National Institutes of Health hospital in Bethesda, Md.