That may work if you know immediately that you were exposed to someone with smallpox and could try to get your immunity up before the virus has spread through your body (or your kids'), but if you only realize it when you start seeing the blisters, it would be too late. I think I'll stay with the idea of getting my kids out of the country for a while and into some remote area where there aren't many people. I can do that unless they block us from leaving.