Pham arrives at National Institutes of Health center in Bethesda, Maryland for treatment in a specialized isolation unit, with staff that specialize in infectious disease and critical care. The NIH facility has one of four isolation units in the nation. NIH says staff specializing in infectious disease and critical care will treat the 26-year-old nurse. Pham left the Dallas hospital in an ambulance about 6 p.m. as dozens of nurses cheered and waved signs bearing messages of affection and good wishes. She was taken to Dallas Love Field, where she boarded the same executive jet used to fly a co-worker to an Atlanta hospital on Wednesday. The jet took off shortly after 7 p.m. Hospital spokesman Wendell Watson said Pham’s transfer is necessary because numerous employees are being monitored for symptoms and aren’t available to work.