Fig. 2.

Variations of nucleotide numbers in SARS-CoV-2 lineages. Nucleotide numbers of each month are presented as mean ± standard deviation with sample numbers on top of the graph. Data from sample number below 30 are excluded for analysis, except those for S clade (in red square frame). Values in red round frame indicate obvious decline in sample numbers compared to previous months. Value above or below each line indicates overall variation between the last and the first month. * indicates significant difference (p < 0.05). GK and GRY clades are not surveyed separately, because sequences of these two clades overlap greatly with those of Delta and Alpha variants. Please refer to Table S1 for original data (values in blue colour). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Variations of nucleotide numbers in SARS-CoV-2 lineages. Nucleotide numbers of each month are presented as mean ± standard deviation with sample numbers on top of the graph. Data from sample number below 30 are excluded for analysis, except those for S clade (in red square frame). Values in red round frame indicate obvious decline in sample numbers compared to previous months. Value above or below each line indicates overall variation between the last and the first month. * indicates significant difference (p < 0.05). GK and GRY clades are not surveyed separately, because sequences of these two clades overlap greatly with those of Delta and Alpha variants. Please refer to Table S1 for original data (values in blue colour). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)