Well, like I said, there is still a chance of collateral damage, which is why there has been so much study to try and make sure that isn't going to happen. We've been sitting on the ability to do this for a long time. As for chances of killing other species, I don't think that is a risk from the method. They basically just breed mosquitoes of the targeted breed, and modify their genes so they can only have male offspring which can also only produce male offspring, etc.