In her first extensive interview since undergoing a bone marrow transplant in September, Robin Roberts discusses her recovery and explains why she recently had to return to the hospital to be treated for a virus.

The interview was conducted for a local TV station by Roberts' sister Sally-Ann -- who served as the donor for her bone marrow transplant -- and a portion of it aired on Tuesday's GMA. "It's a journey that kind of zig zags and there are complications and things like that," the GMA co-host said about her health progress. "But I feel good, I feel stronger every day."

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