State inoculation laws—which are designed to reduce or eliminate the risk of infection from the most common communicable diseases—typically grant students with medical concerns exemptions from having to receive vaccines or vaccine components. Moreover, as reflected in the cases discussed below, most states allow nonmedical exemptions for religious reasons and philosophical beliefs (National Vaccine Information Center 2016).

As reviewed in the next section, disputes over vaccinations generated a fair amount of litigation. In these cases, parents challenged vaccination laws as violating their constitutional rights to be free from government interference or to freedom of religion.