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Quarantine and Isolation
Section NavigationLegal Authorities for Public Health Orders
Federal isolation and quarantine are authorized for these communicable diseases
Cholera
Diphtheria
Infectious tuberculosis
Plague
Smallpox
Yellow fever
Viral hemorrhagic fevers
Severe acute respiratory syndromes
Flu that can cause a pandemic
Federal isolation and quarantine are authorized by Executive Order of the President. The President can revise this list by Executive Order.

Isolation and Quarantine
Isolation and quarantine help protect the public by preventing exposure to people who have or may have a contagious disease.

Isolation separates sick people with a quarantinable communicable disease from people who are not sick.
Quarantine separates and restricts the movement of people who were exposed to a contagious disease to see if they become sick.
In addition to serving as medical functions, isolation and quarantine also are “police power” functions, derived from the right of the state to take action affecting individuals for the benefit of society.

Federal Law
The federal government derives its authority for isolation and quarantine from the Commerce Clause of the U.S. Constitution.

Under section 361 of the Public Health Service Act (42 U.S. Code § 264), the U.S. Secretary of Health and Human Services is authorized to take measures to prevent the entry and spread of communicable diseases from foreign countries into the United States and between states.

The authority for carrying out these functions on a daily basis has been delegated to the Centers for Disease Control and Prevention (CDC).

CDC’s Role
Under 42 Code of Federal Regulations parts 70 and 71, CDC is authorized to detain, medically examine, and release persons arriving into the United States and traveling between states who are suspected of carrying these communicable diseases.

As part of its federal authority, CDC routinely monitors persons arriving at U.S. land border crossings and passengers and crew arriving at U.S. ports of entry for signs or symptoms of communicable diseases.

When alerted about an ill passenger or crew member by the pilot of a plane or captain of a ship, CDC may detain passengers and crew as necessary to investigate whether the cause of the illness on board is a communicable disease.

State, Local, and Tribal Law
States have police power functions to protect the health, safety, and welfare of persons within their borders. To control the spread of disease within their borders, states have laws to enforce the use of isolation and quarantine.

These laws can vary from state to state and can be specific or broad. In some states, local health authorities implement state law. In most states, breaking a quarantine order is a criminal misdemeanor.

Tribes also have police power authority to take actions that promote the health, safety, and welfare of their own tribal members. Tribal health authorities may enforce their own isolation and quarantine laws within tribal lands, if such laws exist.

Who Is in Charge
The federal government
Acts to prevent the entry of communicable diseases into the United States. Quarantine and isolation may be used at U.S. ports of entry.
Is authorized to take measures to prevent the spread of communicable diseases between states.
May accept state and local assistance in enforcing federal quarantine.
May assist state and local authorities in preventing the spread of communicable diseases.
State, local, and tribal authorities
Enforce isolation and quarantine within their borders.
It is possible for federal, state, local, and tribal health authorities to have and use all at the same time separate but coexisting legal quarantine power in certain events. In the event of a conflict, federal law is supreme.

Enforcement
If a quarantinable disease is suspected or identified, CDC may issue a federal isolation or quarantine order.

Public health authorities at the federal, state, local, and tribal levels may sometimes seek help from police or other law enforcement officers to enforce a public health order.

U.S. Customs and Border Protection and U.S. Coast Guard officers are authorized to help enforce federal quarantine orders.

Breaking a federal quarantine order is punishable by fines and imprisonment.

Federal law allows the conditional release of persons from quarantine if they comply with medical monitoring and surveillance.

In the rare event that a federal order is issued by CDC, those individuals will be provided with an order for quarantine or isolation. An example of a Quarantine Order for Novel Coronavirus (print-only) pdf icon[PDF – 5 pages] is provided. This document outlines the rationale of the federal order as well as information on where the individual will be located, quarantine requirements including the length of the order, CDC’s legal authority, and information outlining what the individual can expect while under federal order.

Federal Quarantine Rarely used
Large-scale isolation and quarantine was last enforced during the influenza (“Spanish Flu”) pandemic in 1918–1919. In recent history, only a few public health events have prompted federal isolation or quarantine orders.

Specific Laws and Regulations Applying to Quarantine and Isolation
Visit the Specific Laws and Regulations Governing the Control of Communicable Diseases page.

Guidance for Importation of Human Remains into the United States for Interment
Visit the Guidance for Importation of Human Remains into the United States for Interment or Subsequent Cremation page.

Page last reviewed: February 24, 2020
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Quarantine and Isolation
About Quarantine and Isolation
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Quarantine Stations
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Legal Authorities for Public Health Orders
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Order Suspending Introduction of Certain Persons from Countries Where a Communicable Disease Exists
FRN: Federal Travel Restrictions for Public Health Purposes
Specific Laws and Regulations
Final Rules for Control of Communicable Diseases: Interstate and Foreign – Scope and Definitions
Final Rule for Control of Communicable Diseases: Interstate and Foreign
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Interim Final Rule for Control of Communicable Diseases: Foreign Quarantine
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Airline Guidance
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Cruise Ship Guidance
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Cargo Ship Guidance
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Maritime Resources
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Contact Investigation
Travel Restrictions
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Related Links
Importation
United States – Mexico Public Health
Travelers’ Health
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Funding and Guidance for State and Local Health Departments
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Division of Global Migration and Quarantine
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