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Variants of severe acute respiratory syndrome coronavirus 2 ( SARS-CoV-2) are viruses that, while similar to the original, have genetic changes that are of enough significance to lead virologists to label them separately. SARS-CoV-2 is the virus that causes coronavirus disease 2019 (COVID-19).
- SARS-CoV-2 Omicron variant
Omicron (B.1.1.529) is a variant of SARS-CoV-2 first...
- SARS-CoV-2 Delta variant
The Delta variant (B.1.617.2) was [3] [4] a variant of...
- SARS-CoV-2 Omicron variant
Feb 6, 2023 · CDC uses viral genomic surveillance to quickly identify and track COVID-19 variants, and acts upon these findings to protect the public’s health. Some variants spread more easily and quickly than others, which may lead to more cases of COVID-19. For the most up to date information about current variants, visit CDC’s COVID Data Tracker.
Sep 1, 2023 · It’s estimated that Delta caused more than twice as many infections as previous variants—in Connecticut, it was estimated to have been 80 to 90% more transmissible than the Alpha variant. In the U.S., in June 2021, after a steady decline in COVID-19 cases and hospitalizations, the arrival of Delta coincided with a rapid reversal of that trend.
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- kathy.katella-cofrancesco@yale.edu
Since the beginning of the COVID-19 pandemic and with the evolution of the SARS-CoV-2 virus, multiple COVID-19 Variants of Concern (VOCs) and Variants of Interest (VOIs) have been designated by WHO based on their assessed potential for expansion and replacement of prior variants, for causing new waves with increased circulation, and for the need for adjustments to public health actions.
Mar 24, 2021 · Across the world, there are multiple variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes coronavirus disease 2019 (Covid-19).
