Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
UPDATE
Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the guidance for fully vaccinated people. CDC recommends universal indoor masking for all teachers, staff, students, and visitors to K-12 schools, regardless of vaccination status. Children should return to full-time in-person learning in the fall with layered prevention strategies in place.
UPDATE
The White House announced that vaccines will be required for international travelers coming into the United States, with an effective date of November 8, 2021. For purposes of entry into the United States, vaccines accepted will include FDA approved or authorized and WHO Emergency Use Listing vaccines. More information is available here.
UPDATE
Travel requirements to enter the United States are changing, starting November 8, 2021. More information is available here.

Variants and Genomic Surveillance for SARS-CoV-2

Variants and Genomic Surveillance for SARS-CoV-2
Updated Apr. 2, 2021
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Variant Proportions

Proportions of variants of concern and variants of interest in the US.
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Genomic Surveillance

What is a variant?

Viruses constantly change through mutation, and new variants of a virus are expected to occur over time.

About Variants of the Virus
Omicron Variant

The Omicron Variant of Concern has been detected in the United States. CDC is following the details of this new variant. CDC’s Media Statement

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About Variants
Viruses are constantly changing, including the virus that causes COVID-19. These changes occur over time and can lead to the emergence of variants that may have new characteristics. Vaccines continue to reduce a person's risk of contracting the virus that cause COVID-19. Vaccines are highly effective against severe illness.
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Variant Proportions in the U.S.

View data showing proportions of Variants of Concern and Variants of Interest.

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Global Variant Reports

View a global map showing reports of variants in each country.

Research and Selected Publications