List of VOCs and VOIs and their date of designation according to the CDC and WHO
| Variant name | Class | Date of designation according to the CDC and WHO |
| Alpha | VOC | 29 December 2020 |
| Beta | VOC | 29 December 2020 |
| Gamma | VOC | 29 December 2020 |
| Epsilon | VOI | 26 February 2021 |
| Iota | VOI | 26 February 2021 |
| Zeta | VOI | 26 February 2021 |
| Kappa | VOI | 07 May 2021 |
| Theta | VOI | 24 May 2021 |
| Lambda | VOI | 04 Jun 2021 |
| Delta | VOC | 15 Jun 2021 |
| Mu | VOI | 30 Aug 2021 |
CDC, Centers for Disease Control and Prevention; VOC, variants of concern; VOI, variants of interest.