Robin Roberts is back home Monday after a second stay at the hospital.

The "Good Morning America" anchor was hospitalized again for a week because of a virus her delicate immune system was having trouble fighting.

Roberts underwent a bone marrow transplant in September, three months after she announced she was suffering from a rare disease called MDS.

Roberts wrote this update on Facebook:

After about a week back in the hospital, I returned home Friday night. A latent virus, many of us have, was not responding to medication and was pulling down my numbers. Our immune systems usually take care of a virus like this ... but mine is only 59 days old. Physically I felt fine but being back in the hospital took an emotional toll on me. The wonderful doctors, nurses and support staff lifted my spirits. It was comforting seeing them again. They assured me the majority of BMT patients have to be re-admitted to the hospital for various reasons. I decided to look at my brief stay as a "tune up" ... and then I would be back on the road to recovery. By the grace of God, I am! The virus is under control and my numbers are going back up. My sister, Sally-Ann, flew to NYC to be with me. Before I was discharged on Friday she interviewed me. Her station in New Orleans, WWL-TV, has done an incredible job bringing attention to the need for donors like my big sis. "GMA" will show a portion of the interview Tuesday morning. I've been moved to tears by my "GMA" family's (and YOUR) genuine support, concern and love. Have a blessed Sunday. XO