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. 2022 Dec 7;28(45):6328–6344. doi: 10.3748/wjg.v28.i45.6328

Table 1.

Variants of concern reported for coronavirus disease 2019

VOCs
First time reported
Country of origin
Alpha (B.1.1.7) December 2020 United Kingdom
Beta (B.1.351) December 2020 South Africa
Gamma (P.1) January 2021 Brazil
Delta (B.1.617.2) December 2020 India
Omicron (B.1.1.529) November 2021 South Africa

VOC: Variants of concern.