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   Con gressional                                                         _______
           * Research Service
   .... ..       nformrng the Iegislative debate since 1914





An Overview of State and Federal Authority to

Impose Vaccination Requirements



May 22, 2019
According to the latest available data from the Centers for Disease Control and Protection (CDC), 7 states
in the United States are currently in the midst of 10 separate measles outbreaks. With 880 total confirmed
cases so far this year, 2019 now has the greatest number of reported cases of measles since 1994 and since
measles was declared eliminated in the United States in 2000. These cases, the majority of which involves
unvaccinated individuals, follows a number of notable measles outbreaks over the past several years,
including an outbreak of 383 cases in 2014 among unvaccinated Amish communities in Ohio and another
multi-state outbreak of 147 cases in 2015 linked to an amusement park in California. In addition to
measles, for about every 5 years since 2006, outbreaks of other vaccine-preventable diseases, such as
mumps, have also been reported in the United States. In light of these outbreaks and their association with
unvaccinated individuals, this Sidebar provides an overview of the relevant state and federal authority to
require vaccination for U.S. residents.

State and Local Authority Over Vaccination
Under the federalist system of the United States, state governments have the general authority, within
constitutional limits, to enact laws to provide for the public health, safety, and morals of the states'
inhabitants. In contrast to this general police power, as discussed below, Congress's power to legislate is
confined to those powers enumerated in the Constitution.
The states' general police power to promote public health and safety encompasses the authority to require
mandatory vaccinations. Pursuant to this authority, states and localities have long enacted various
compulsory vaccination laws for certain populations and circumstances, including for school children and
certain health care workers and in cases of public health emergency. In the early part of the 20th Century,
the Supreme Court twice considered constitutional challenges to such mandatory vaccination
requirements. Each time, the Court rejected the challenges and recognized such laws to fall squarely
within the states' police power. In 1905, the Supreme Court in Jacobson v. Commonwealth of
Massachusetts upheld a state law that gave municipal boards of health the authority to require the
vaccination of persons over the age of 21 against smallpox, determining that the vaccination program had
a real and substantial relation to the protection of the public health and safety. In doing so, the Court
rejected the argument that such a program violated a liberty interest that, under more modem

                                                                 Congressional Research Service
                                                                   https://crsreports.congress.gov
                                                                                      LSB10300

 CRS Legal Sidebar
 Prepared for Members and
 Committees of Congress

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