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Table 1 Number of human SARS-CoV-2 strains in GISAID and the sample sizes included in this study for different periods

From: Modelling the association between COVID-19 transmissibility and D614G substitution in SARS-CoV-2 spike protein: using the surveillance data in California as an example

Period Number of strains
in GISAID in this study
Jan 1–31 6 6
Feb 1–29 16 16
Mar 1–10 72 30
Mar 11–20 94 30
Mar 21–31 158 30
Apr 1–10 100 30
Apr 11–20 21 21
Apr 21–30 50 30
May 1–10 7 7
Total 524 199