Italy France and Spain don't vaccinate against it widely. Most of the few current cases came in via adults from Western Europe and are spread in part by the lac

Italy France and Spain don't vaccinate against it widely. Most of the few current cases came in via adults from Western Europe and are spread in part by the lack of vaccination of US adults. The western europe situation, and low rates of adult immunization have been issues for decades. How to solve the problem? Mandate adult vaccinations? Require immunization certificates for everyone entering the country? These are much larger factors than a few childhood immunization exemptions and a rational approach would thus focus on them first.