IF YOU ARE FULLY VACCINATED
CDC has updated its guidance for people who are fully vaccinated. See Recommendations for Fully Vaccinated People.
IMPORTANT UPDATE FOR SCHOOLS
CDC recommends schools continue to use the current COVID-19 prevention strategies for the 2020-2021 school year. Learn more
Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
UPDATE
Getting vaccinated prevents severe illness, hospitalizations, and death. Unvaccinated people should get vaccinated and continue masking until they are fully vaccinated. With the Delta variant, this is more urgent than ever. CDC has updated guidance for fully vaccinated people based on new evidence on the Delta variant.
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.

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
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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