Fig. 1: The spatial transmission count statistic investigates the transmission dynamic.

a Conceptual figure showing that transmissions can be classified into three categories: import, local transmission, and export. b The schematic tree depicts a total of 18 spatial transmission linkages in Epi-Week X: 6 imports, 9 local transmissions, and 3 exports. c In the time-adjusted phylogeny, branches are colored based on the categories of the corresponding spatial transmission linkages. d The time series of spatial transmission counts summarizes the epidemic trend in Texas.