Before revision:  Evolutionary relationship analysis shows that about 13 strains of the COVID-19 virus sequenced in 5 countriesare very likely to be connected to or can potentially lead researchers to find the first generation COVID-19 virus and its origin .
After revision:  Evolutionary relationship analysis shows that about 13 strains of the COVID-19 virus sequenced in 5 countriesare very likely to be connected to or can potentially lead researchers to find the first generation COVID-19 is actively evolving in human hosts. From all existing human COVID-19 genome sequences, we calculated the first common model that represents the shared sequences of the human COVID-19 strains, which provides important information for vaccine and antibody development. Geographic and time-course analysis of the evolutionary trees of the human COVID-19 reveals possibly heterogeneous evolutional paths among strains from 21 countries. This finding has important implications to the management of COVID-19 and the development of vaccines .