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  2. Aug 11, 2021 · Delta Variant. The Delta variant causes more infections and spreads faster than earlier forms of the virus that causes COVID-19. Learn More. Variant Proportions in the U.S. Variant Surveillance. Variant Classifications and Definitions. Last Updated Aug. 11, 2021. Content source: National Center for Immunization and Respiratory Diseases (NCIRD ...

  3. Apr 02, 2021 · This page provides information on the variants of SARS-CoV-2, the virus that causes COVID-19, and describes the activities of the CDC and public health partners to monitor and study the effects of SARS-CoV-2 variants.

  4. Oct 04, 2021 · CDC’s national genomic surveillance program identifies new and emerging SARS-CoV-2 variants to determine implications for COVID-19 diagnostics, treatments, or vaccines approved or authorized for use in the United States. Sequences with similar genetic changes are grouped into lineages, and multiple lineages can have the same substitutions.

  5. Nov 01, 2021 · Variants are expected. The best way to slow the emergence of new variants is to reduce the spread of infection by taking measures to protect yourself, including getting a COVID-19 vaccine when available. Vaccines can keep you from getting sick, being hospitalized, or dying from COVID-19. All COVID-19 tests can detect all variants, but they will ...

  6. Aug 06, 2021 · The virus that causes COVID-19 is constantly changing, and new variants of the virus are expected to occur. Sometimes new variants emerge and disappear. Other times, new variants persist. Numerous variants of the virus that causes COVID-19 are being tracked in the United States and globally during this pandemic.

  7. Dec 29, 2020 · Multiple SARS-CoV-2 variants are circulating globally. Several new variants emerged in the fall of 2020, most notably: In the United Kingdom (UK), a new variant of SARS-CoV-2 (known as 20I/501Y.V1, VOC 202012/01, or B.1.1.7) emerged with a large number of mutations. This variant has since been detected in numerous countries around the world ...

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