The condition of Dr. Craig Spencer, the New York physician infected with Ebola virus disease, has been upgraded to stable from serious but stable, the New York City Health and Hospitals Corp., or HHC, said Saturday. Spencer, the first and only confirmed Ebola patient in New York, has been responding well to treatment at the Bellevue Hospital Center in Manhattan since his admission nine days ago.

HHC, the agency that runs the hospital, issued the upgrade update via Twitter Saturday. Spencer is said to be receiving the same treatment that has proven effective in treating Ebola patients at Atlanta’s Emory University Hospital and Omaha’s Nebraska Medical Center, the Associated Press reported.

Spencer’s case led to the controversial Ebola mandatory-quarantine plans instituted recently by New York Gov. Andrew Cuomo and New Jersey Gov. Chris Christie. The health-care worker became infected with the disease while treating patients in Guinea.