“A national outbreak, or an outright national-level measles resurgence, would not be out of the ordinary for a Western country. In recent years, there have been several large sustained outbreaks in Europe… It’s not just luck that the United States hasn’t seen a similar resurgence. There are many things the United States does right in vaccine policy, compared to Europe. For example, the United States has a tapestry of school-entry vaccine requirements that work. These requirements, based in state laws, have contributed to maintaining high immunization rates and keeping rates of vaccine noncompliance low… Mandates have played a key role in keeping disease rates low.”