Survival doesn't mean it is likely to infect. Even if you can demonstrate that the virus stays intact in a dried blood stain, it is extremely unlikely to make it's way into your circulation from there. Since if you touch the dried stain, not much material will stick on your hands, and even if you managed to bring a few virus particles to your mouth by accident, it is not very contagious via the oral route (compared to direct blood contact or vaginal or anal intercourse).