If I said I had a vaccine, one or two shots, that would prevent certain cancers, what would you say? You’d certainly be interested. You’d ask, “What are the side effects?” I’d tell you they could include pain at the injection site and a fever, possibly some swelling where the shot was given. Then you might ask, “How long has the vaccine been around?” In this case, it’s about 20 years, which is long enough for significant other side effects to show up, if there were any. Then
