Availability of data
Sequences were uploaded to GISAID under the following IDs for year 2020: EPI_ISL_812922, EPI_ISL_760247, EPI_ISL_17454567, EPI_ISL_17436319, EPI_ISL_17454569, EPI_ISL_654872-EPI_ISL_654874, EPI_ISL_17433648-EPI_ISL_17433661, EPI_ISL_654866-EPI_ISL_654870, EPI_ISL_654886-EPI_ISL_654889, and EPI_ISL_654875-EPI_ISL_654884. For 2021, the IDs were: EPI_ISL_16034578, EPI_ISL_16034555-EPI_ISL_16034573, EPI_ISL_16034575-EPI_ISL_16060862, and EPI_ISL_17433647.