But not all viruses are double stranded RNA type.
Correct. I, at least, would expect the drug would likely be less effective against those that don't use double-stranded RNA. It might have *some* effect - the rate of binding to single-strand need not be zero...
But still, I wonder why he's making claims about how DRACO could cure the human cold, influenza, and HIV, as these are all single-strand viruses.
Edit: Oh, I see!
The drug binds to the RNA not in the virus, or even as the viral RNA is floating around in the cell, but *during transcription*. A that point, you will have double-strand RNA in the cell, and the drug will work.