Another benefit of a national policy would be improved coverage between states. Vaccine-preventable diseases are not contained within state borders, and our vaccine policies should not be either. With the status quo, lax immunization policies in one state can lead to outbreaks in neighboring states. In addition, the national policy would increase equity for children who live in different states. Currently, less than 0.1 percent of kindergartners are exempt from vaccines in Mississippi, a state that does not permit religious or philosophical exemptions. In contrast, 6.2 percent of children are exempt from vaccines in Washington state, a state where both religious and philosophical exemptions are allowed. Geographic location should not influence access to lifesaving vaccines.