NEW YORK -

"Good Morning America" anchor Robin Roberts appears to be improving despite a slight setback last month that sent her back to the hospital.

Roberts posted a picture Tuesday on her Twitter account of her taking a walk in New York City with co-anchors Josh Elliott and Sam Champion.

"How lucky am I to have these two, and , take me for my afternoon walk," Roberts said.

Roberts spent a week in the hospital because of a virus her delicate immune system was having trouble fighting.

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