dr. anthony fauci he has been working with aids since 1981. good to see you, thank you for being with us. >> good to be with you. >> let me ask you about what a big deal this is. is. i remember talking to you back in the day when this was still something that we didn't know how it would end. when a.i.d.s. first surfaced, there were people who thought this was going to be the worst thing that the world had ever seen. it certainly felt that way. then we got to the point where if you could get access to the treatment, it was treatable. this is a major breakthrough. >> you know, ali, i think you have to put it in context and why i'm a bit muted about it being a major breakthrough. this is a bone marrow transplant that was done on someone who needed a transplant because they had hodgkin's disease, and the transplant was to both cure the hodgkin's, but what they did is took the marrow from a donor who had a genetic defect that doesn't make the person sick but a genetic defect that doesn't