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February 2, 2023
The Advisory Committee on Immunization Practices (ACIP)

The Advisory Committee on Immunization Practices
(ACIP) is a committee of nonfederal experts who make
recommendations to the Department of Health and Human
Services (HHS) regarding the use of vaccines and related
agents for the control of vaccine-preventable disease in the
U.S. civilian population. As a critical function, ACIP
recommendations inform the Centers for Disease Control
and Prevention's (CDC's) annual immunization schedules
of recommended vaccines for both children and adolescents
(18 years of age and younger) and adults (19 years of age
and older). ACIP may also make recommendations
regarding nonroutine vaccines, including for use in
emergency situations such as the Coronavirus Disease 2019
(COVID-19) pandemic or the mpox outbreak.
ACIP Establishment and History
The Advisory Committee on Immunization Practices was
established by the Surgeon General in March 1964 under
general authority provided by Public Health Service Act
(PHSA) in Section 222 (42 U.S.C. §217a). ACIP was
established to provide ongoing expert advice on federal
immunization policy in response to expanded federal
immunization programs and the licensure of several new
vaccines. In 1972, ACIP was designated a federal advisory
committee under the Federal Advisory Committee Act
(FACA, P.L. 92-463; 5 U.S.C. Appendix).
Overvi ew
Today, ACIP provides recommendations to CDC, the lead
federal agency for domestic public health and immunization
programs. The committee remains authorized under general
authority, and its structure and functions are governed by its
official charter per FACA requirements. However, under
several federal laws, ACIP and its recommendations play a
role in defining the relevant statutory requirements (as
explained below in the Statutory Roles section.)
Structure and Membership
Per its charter, ACIP currently consists of 15 voting
members who have clinical, scientific, and public health
expertise in immunization. One lay member is a consumer
representative with knowledge about social and community
aspects of immunization programs. In addition, several
federal health officials and representatives from national
health organizations (e.g., American Academy of
Pediatrics) serve as nonvoting representatives.
Voting members are appointed by the HHS Secretary and
serve overlapping four-year terms. Anyone can apply to
become a member, with selection based on meeting certain
qualifications. Per HHS policy, the department seeks to
balance committee membership in terms of points of view,
professional training, and personal backgrounds.

ACIP holds full-committee public meetings at least three
times per year to review evidence and vote on new
recommendations. Outside these meetings, ACIP members
serve on work groups to review evidence regarding specific
vaccines on an ongoing basis. ACIP work groups can solicit
and consider public comments. ACIP work groups present
evidence reviews and draft recommendations to the full
committee for consideration. Final recommendations must
receive a vote from a majority of the committee.
Recommendation Process and Criteria
ACIP recommendations regarding vaccines and their use
are related to, but distinct from, the U.S. Food and Drug
Administration's (FDA's) licensure or authorization of
vaccines. Per its charter, ACIP recommendations are
focused on the control of vaccine-preventable diseases,
whereas FDA generally focuses its review on the safety and
efficacy of vaccines and the processes used to manufacture
them. ACIP typically makes its recommendations after
FDA has approved or authorized a new vaccine (or an
existing vaccine for a new indication). Per a requirement
added by the 21st Century Cures Act of 2016 (Cures Act;
P.L. 114-255, §309), ACIP must consider any newly
licensed vaccine (or new indication) at the committee's next
regularly scheduled meeting. In addition, ACIP can make
recommendations regarding other medical products (e.g.,
antimicrobial therapy) shown to be effective against a
disease for which a vaccine is available.
In its review and recommendation process, ACIP weighs
whether the benefits of recommending a certain vaccine for
a certain population-including the impact of such a
recommendation on disease transmission or reduction in
disease, hospitalizations, and deaths-outweigh any
possible harms at an individual or population level. Harms
could include, for example, considerations around vaccine
safety (individual level) or disease distribution within the
population (population level). ACIP also considers the
potential public health importance, quality of the evidence
used, implementation considerations, equity, and values and
preferences of the people affected. In a few cases, ACIP's
recommendations have differed from FDA-approved
indications for use, resulting in recommendations for off-
label use of vaccines.
ACIP recommendations can be informed by the FDA-
approved vaccine label, published and unpublished clinical
data from the vaccine manufacturer, and other independent
studies. ACIP follows the Grading of Recommendations,
Assessment, Development and Evaluation (GRADE)
approach for determining the quality and strength of
evidence for recommendations. The GRADE approach is
commonly used for formulating health recommendations in
the United States and around the world.

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