One could never be sure...but hopefully, that may be it xP
"While researchers -- and the doctors themselves -- caution that the case might be no more than a fluke, others say it may inspire a greater interest in gene therapy to fight the disease that claims 2 million lives each year. The virus has infected 33 million people worldwide."
Anything could happen...maybe the bone marrow transplant is only a temporary solution. Maybe the symptoms might reappear...
Anyhow, that's something