I understand, according the article, that they used 'a modified, harmless version of HIV.' I am curious as to how they treat the HIV afterwards though. Can they cure this strain.? Will the remaining white blood cells fight it off? Do they have to treat it forever now? But like another poster stated, it would be a better trade off for many. I am happy that they were still able perform the experiment though, in spite of the initial lack of funding. It's nice to think that potentially millions of lives can be saved from this.