CDC LOCS Lab Advisory: CDC Classifies SARS-CoV-2 Variant B.1.617.2 (Delta) a Variant of Concern

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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Online Resources:

• SARS-CoV-2 Variant Classifications and Definitions
• Variant Proportions in the United States
• Information for Laboratories about Coronavirus (COVID-19)
• Frequently Asked Questions about Coronavirus (COVID-19) for Laboratories
• CDC Coronavirus (COVID-19) Website
• CDC Laboratory Outreach Communication System (LOCS)
• Clinical Laboratory COVID-19 Response Calls

This Lab Advisory was originally published by the CDC Laboratory Outreach Communication System (LOCS).