Doctors have upgraded the condition of New York City’s first Ebola patient, health officials said on Saturday.

In a statement on Saturday, the city’s Health and Hospitals Corporation said that because the patient, Dr. Craig Spencer, had responded to treatment, it was “updating his condition to ‘stable’ from ‘serious but stable.’ ”

Dr. Spencer, who treated Ebola patients in Guinea, was to remain in isolation at Bellevue Hospital Center in Manhattan, where he was taken on Oct. 23 after developing a fever, the statement said. Dr. Spencer, 33, has been receiving antiviral and blood-plasma therapies that have been successful in treating Ebola patients at Emory University Hospital in Atlanta and Nebraska Medical Center in Omaha. Details of his therapy are not known, but other patients have improved after getting transfusions of blood products from people who have recovered from Ebola.

The statement said Dr. Spencer, the only person with the virus to be hospitalized in New York, would continue to receive full treatment.