Robin Roberts -- on leave from "Good Morning America" following a bone-marrow transplant in early September -- told followers on a Facebook post Sunday that she was hospitalized last week for a viral infection, Newsday's Verne Gay reports. Doctors and nurses, she said, "assured me the majority of BMT patients have to be readmitted 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!" Her sister and donor, Sally-Ann, interviewed Roberts for a piece airing on "GMA" this morning.