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Not only are viruses a cool (if somewhat nefarious) DNA-delivery system (though, HIV being a retrovirus probably means that it delivered RNA instead of DNA), but it can be targeted. HIV viral particles attack human immune cells, which just happen to be the general cell type that needs to be treated in this case! Using something like hepatitis or HPV probably would do the trick here since those viruses wouldn't have the keys to unlock the doors to get inside of the T cells.