Fig. 1: The COVID-19 cases in Beijing and sequenced in this study.

a The geographic sources of the cases in our hospital. b The number of cases in Wuhan group (from or passed by Wuhan), local group (onset locally and without Wuhan or overseas travel history), and imported group (overseas imported) in our hospital. The histograms represent the daily case numbers and the lines show cumulative case numbers in the three groups. c The number of well-sequenced cases (n = 102). The histograms represent the sequenced case numbers on each day and the orange line shows the cumulative case numbers. d The average sequencing coverage among the sequenced cases (n = 102). The shadow represents the lower and upper quartiles. Source data are provided as a Source Data file.