During the past month, the American public has been bombarded with news reports about a continuing measles epidemic, as well as an extensive debate about whether measles vaccinations should be required to stop this epidemic and prevent future ones from developing.
In fact, all states require vaccinations against many contagious diseases, including measles. But there are exceptions, and the exceptions are broader in some states than others. Only a handful of states limit exceptions to medical necessity – for example, a child whose immune system is compromised by chemotherapy should not receive immunizations. Most states allow religious exemptions, so parents who are, for example, Christian Scientists need not vaccinate their children in contravention of their religious beliefs. However, about a third of the states, including Wisconsin, also allow much broader exemptions based on “conscience” or “philosophical reasons.” These broader exemption categories often can be invoked with little or no effort on a parent’s part, such as by checking a box on a form and signing it, and thus have the potential to erode the requirement if enough people choose not to vaccinate.