How CDC determines the risk level for COVID-19 travel health notices
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How CDC determines the risk level for COVID-19 travel health notices

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    • Corporate Authors:
      National Center for Immunization and Respiratory Diseases (U.S.). Division of Viral Diseases.
    • Description:
      Updated June 7, 2021

      Updates as of June 7, 2021:

      Primary and secondary criteria used to determine Travel Health Notice (THN) levels were updated to better differentiate countries with severe outbreak situations from countries with sustained, but controlled, COVID-19 spread.

      This update gives specific travel advice for vaccinated and unvaccinated people according to the THN level, ensuring THN levels reflect the current global situation and are aligned with guidance for international travel.

      CDC uses Travel Health Notices (THNs) to alert travelers and other audiences to health threats around the world and advise on how to protect themselves.

      On November 21, 2020, CDC adapted its 3-level notice system to a 4-level system for COVID-19 and updated criteria used to determine THN levels. The system was updated to align with the same incidence rate or case count thresholds adopted by recognized public health organizations and shares a common 4-level structure with the U.S. Department of State’s Travel Advisory system.

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