Review
Copyright ©The Author(s) 2022.
World J Gastroenterol. Dec 7, 2022; 28(45): 6328-6344
Published online Dec 7, 2022. 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 2020United Kingdom
Beta (B.1.351)December 2020South Africa
Gamma (P.1)January 2021Brazil
Delta (B.1.617.2)December 2020India
Omicron (B.1.1.529)November 2021South Africa