April 22, 2024

Can the federal government mandate vaccines?

The extent to which states and/or employers might adopt COVID-19 vaccine mandates remains an open question but could affect the distribution and uptake of vaccinations. 

Key takeaways include the following:

  • The federal government’s authority to institute a general vaccine mandate is unclear, and has not yet been tested in the courts, though it is likely limited at best.
  • States’ authority to mandate vaccines to protect public health is well-established. Currently, all states require vaccines for school attendance, while state vaccine requirements for health care workers vary. More generally, though, states do not use mandates for adult vaccination and have thus far said they are not mandating COVID-19 vaccination
  • Some private employers require influenza vaccines for employees in health care settings, unless prohibited by state law, and some employers and universities have already instituted mandates for COVID-19 vaccination for employees and/or students; at the same time, several states have sought to limit their ability to do so.
  • More generally, however, it is unclear whether COVID-19 vaccines can be mandated while operating under an EUA, and courts have not yet ruled on this issue.
  • When in place, under federal law, vaccine mandates may be subject to exemptions based on disability or religious objection.

As COVID-19 vaccination efforts progress, it will be important to monitor any changes in government or employer policy as well as public opinion on vaccine mandates.


The extent to which states and/or employers might adopt COVID-19 vaccine mandates remains an open question but could affect the distribution and uptake of vaccinations. A substantial share of the population must acquire immunity, either through vaccination or previous infection, in order to get the pandemic under control. With several vaccines available for emergency use in the U.S. and distribution efforts underway, policymakers and public health officials are increasingly focusing on ways to accelerate the pace and maximize the extent of vaccine uptake. These efforts include increasing vaccine supply and relaxing eligibility requirements, public education and outreach campaigns, ensuring the accessibility of vaccine administration sites, job-based incentives, and even mandates. Indeed, COVID-19 vaccine mandates are likely to become a more prominent issue as soon as any one of the current vaccines operating under an EUA is approved and licensed by the FDA.

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Can the federal government mandate vaccines?

The federal government’s authority to institute a general vaccine mandate is unclear, and has not yet been tested in the courts, though it is likely limited at best. The Commerce Clause of the U.S. Constitution gives Congress the power to regulate commerce between states as well as with foreign countries. Drawing on this authority, the Public Health Service Act (PHSA) authorizes the HHS Secretary to adopt quarantine and isolation measures to prevent the spread of communicable disease among states but does not specifically mention federal vaccine mandates. Read broadly, the PHSA might allow the federal government to mandate vaccines to prevent the transmission of infectious disease between states or from foreign countries, though such measures have not been adopted – or reviewed by courts – to date. It is clear that the federal government does have authority to mandate vaccines for members of the military, and those targeted mandates have been upheld by courts. In addition, federal law mandates certain vaccinations for immigrants seeking to enter the U.S. General vaccine mandates, however, are generally within the purview of state and local governments, as explained below, with the federal government playing a supporting role. For example, the increase in the number of states requiring vaccination to attend school is attributed to urg[ing]” from the CDC after measles outbreaks in the 1960s. Otherwise, the federal government’s public health efforts have been largely focused on quarantine and isolation, rather than vaccine mandates.

Can state governments mandate vaccines?

The U.S. Supreme Court upheld a state vaccine mandate over a century ago, in a case setting out the legal test still applied today. The vaccine mandate in that 1905 case, Jacobson v. Massachusetts, is based on states’ broad authority to regulate individual rights to protect the general health, safety, morals, and welfare of society as a whole, known as the police power. Jacobson involved a city board of health law requiring all adults over age 21 to be vaccinated against smallpox during an outbreak. The city vaccination mandate was adopted pursuant to a state law that authorized local boards of health to “require and enforce” vaccination if “necessary for the public health or safety.” An individual who was fined for refusing to be vaccinated challenged the law, citing general concerns about the vaccine’s safety and efficacy. The Court deferred to the legislature’s judgment that vaccination was a safe and effective means of preventing smallpox and upheld the law as a reasonable regulation of public health and safety. The Court noted that individual constitutional rights are not absolute in all circumstances but instead are subject to “manifold restraints to which every person is necessarily subject for the common good.” The Court concluded that “upon the principle of self-defense, of paramount necessity, a community has the right to protect itself against an epidemic of disease which threatens the safety of its members.”

More at:

Key Questions About COVID-19 Vaccine Mandates | KFF

This issue brief explains the legal basis for vaccine mandates by the federal government, states, and private employers; highlights considerations for mandates while the COVID-19 vaccine is under an EUA; and discusses mandate exemptions based on disability or religious objection.

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