Before revision:  This article reports a computational study of the similarities and the evolutionary relationships of COVID-19 strains from different countries and between COVID-19 and the related viruses using our newly developed big sequence data analysis tool I-MLCS, the existing MEGA 6.0 system, and a clustering algorithm. Similarity analysis shows that two strains of the COVID-19 virus taking rhinolophine as host have very high similarities with the COVID-19 virus taking human as host, although the average similarity between the strains of the virus taking pangolin as host and taking human as host is higher.
After revision:  This article reports a computational study of the similarities and the evolutionary relationships of COVID-19 strains from different countries and between COVID-19 and SARS and MERS, as well as COVID-19 virus taking rhinolophine as host have very high similarities with the COVID-19 virus taking human as host, although the average similarity between the strains of the virus taking pangolin as host and taking human as host is higher.