Well, considering viral genetic code comes in all shapes and forms (single stranded DNA, double stranded DNA, sigle strande RNA, double stranded RNA, segmented double strande RNA) only a subset of them will be affected by DRACO. Granted, RNA virii tend to evolve faster and therefore outrun antiviral agents and vaccines much much faster than DNA virii.
FYI, whoever said, influenza (aka, flu) is not a retrovirus. it's a segmented RNA virus and while it creates copies of its genome in the nucleus, it never has a DNA phase. Considering it is highly contagious and airborne, and that a retrovirus has a much greater chance of generating cancer, then we'd be royally screwed.
It's a very cool idea. For those who asked DRACO would discriminate the presence of an dsRNA virus infection only by the fact that there's dsRNA in the host cell. dsRNA is not normally found at all in cells and A WHOLE LOT of organisms (plants, yeast, fungi, etc, etc) have cellular strategies that detect it and send signals that say "i'm infected, kill me", which in humans the immune system is quite content on doing. This is just aiding that system as a lot of the dsRNA virus have evolved to have proteins that cancel or inhibit that response. As far as I can see, DRACO is trying to use another death pathway to which the virus doesn't yet have a way to stop. Which doesn't mean it won't down the line. And that virus (since this a caspase, and that route is used to tell cells to die under a lot of circumstances) will be one deadly, tumor generating Bad Mother Fucker.