Table 2. Nomenclature, country of origin, date of declaration, and Pangolin lineage of ‘previous VOCs' as of June 2022.

VOC: variants of concern

Source: World Health Organisation [15]

WHO Label	Country of origin	Date of declaration as VOC	Date of declaration as Previous VOC	Pangolin lineage
Alpha	United Kingdom	December 18, 2020	March 9, 2022	B.1.1.7
Beta	South Africa	December 18, 2020	March 9, 2022	B.1.351
Gamma	Brazil	January 11, 2021	March 9, 2022	P.1
Delta	India	April 4, 2021 (VOI: May 11, 2021)	June 7, 2022	B.1.617.2
Omicron	South Africa	November 21, 2021	Newer emerging sublineages dominating the world	B.1.1.529