If you have taken reasonable precautions, I think over worrying about it is a bit of a self indulgence. Which is fine if it is what you want to do -but I think sometimes it takes the focus away from other more real things. People die from stuff every day. I think the regular forms of dying are more likely for most people - heart disease, car accidents, falls in the bathroom (really-I represented a few traumatic brain injury people who fell in the bathroom), cancer, and the like - the usual suspects.