The complete genomic sequences of SARS-CoV-2 were obtained from 2019 Novel Coronavirus Resource (2019nCoVR) [12] and two databases, including the National Center for Biotechnology Information (NCBI) [13] and Global Initiative on Sharing All Influenza Data (GISAID) [14]. The DNA sequences of two other representative CoVs (SARS-CoV and MERS-CoV) were included for comparative analysis. The genomic information of latest SARS-CoV-2 strains is shown in Table S1.