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. 2023 Dec 6;13(50):35500–35524. doi: 10.1039/d3ra06479d

The main known variants of SARS-CoV-2.

Variant of virus SARS-CoV-2 The earliest documented case
Alfa Great Britain, September 2020
Beta North African Republic, May 2020
Gamma Brazil, November 2020
Delta India, October 2020
Omicron Several countries, November 2021