06/15/2021: Lab Advisory: CDC Classifies SARS-CoV-2 Variant B.1.617.2 (Delta) a Variant of Concern

CDC's Laboratory Outreach Communication System (LOCS)

Audience: Individuals Performing COVID-19 Testing

Level: Laboratory Advisory

On June 15, 2021, CDC announced the classification of the SARS-CoV-2 variant B.1.617.2 (Delta) as a variant of concern. This variant was initially identified in India in December 2020 and was previously classified as a variant of interest. The B.1.617.2 (Delta) lineage has been detected in at least 66 countries, including the United States.

Investigations are underway to further characterize B.1.617.2 (Delta) and its potential impact on SARS-CoV-2 transmission, disease severity, and effectiveness of existing tests, vaccines, and treatments.

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For questions, contact us at LOCS@cdc.gov.

Thank you,

The Laboratory Outreach Communication System

Laboratory Outreach Communication System (LOCS) | Division of Laboratory Systems (DLS)

Center for Surveillance, Epidemiology, and Laboratory Services (CSELS)

Centers for Disease Control and Prevention (CDC)

LOCS@cdc.gov

www.cdc.gov/csels/dls/locs

Page last reviewed: April 12, 2021