-Availability of data and materials
All data are publicly available.
https://ourworldindata.org/grapher/covid-variants-area Competing
interests
The authors declare that they have no competing interests.-Funding The work described in this paper was partially supported by a grant
from the Research Grants Council of the Hong Kong Special Administrative
Region, China (HKU C7123-20G).
-Authors’ contributionsAll authors conceived the study, carried out the analysis, wrote the
draft, revised the manuscript critically, and approved it for
publishing.
Funding The work described in this paper was partially supported by a grant
from the Research Grants Council of the Hong Kong Special Administrative
Region, China (HKU C7123-20G).
-AcknowledgementsNone.