How did U.S. Supreme Court decisions affect compulsory school vaccination laws?

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Infographic showing estimated lives saved by childhood vaccinations worldwide from 1974 to 2024, with syringe-shaped bars for each disease. Measles tops the list at 93.71 million lives saved, followed by tetanus, whooping cough, and others, for a total of 153.84 million lives saved. — vaccine Vaccines and the estimates of lives saved over the period 1974–2024.

U.S. Supreme Court decisions have been foundational in establishing the constitutionality of compulsory school vaccination laws, affirming that they are a legitimate exercise of state police power to protect public health.12

The legal precedent was established by two key rulings:

Jacobson v. Massachusetts (1905): While this case focused on general compulsory vaccination, the Court ruled that state and local governments have the authority to enact such laws. The Court held that individual liberty is not absolute and that the state may impose reasonable restraints to protect the general welfare and public health.3
Zucht v. King (1922): Building on the Jacobson precedent, the Supreme Court specifically affirmed the constitutionality of school-entry vaccination mandates. The ruling confirmed that schools have the legal authority to exclude unvaccinated students.13

These decisions established that while states may permit medical or other exemptions, the requirement for vaccination as a condition of school attendance is a valid regulatory measure. This legal framework has supported the implementation of vaccination requirements across all U.S. states, which were fully in place by 1980.123