Evolutionary relationships of Schistosoma japonicum

Abstract Purpose: In this research, I investigated the phylogenetic relationships of Sschistosoma sinensium and Schistosoma japonicum, as well as the relationships between East Asia S. japonicum and Southeast Asia S. japonicum. Results: The results of nucleotide BLAST showed that Sichuan S. sinensium AF465913.1 shares 72.29% identity with Jiangxi S. japonicum FJ852203.1. The E value is < 0.01. Schistosoma sinesium gave rise to S. japonicum in Jiangxi. Jiangxi S. japonicum spread to other parts of China, then to Japan, Southeast Asia, and Taiwan. It is close to, for example, S. japonicum from Anhui Tongling, Hunan Changde, and Indonesia. For example, the ND1 gene sequence of Jiangxi S. japonicum KP793763.1 shares 100% identity with that of Hunan Chande S. japonicum KP793756.1, 99.89% identity with Anhui Tonling S. japonicum KP793747.1 and Indonesia S. japonicum KP793779.1. E values = 0.0. Commonly, Indonesian S. japonicum, which includes S. japonicum from Anhui Guichi, Anhui Tongling, Hunan Changde, and Hunan Yueyang, is found in China. The genetic relationships of S. japonicum species are close to each others. Conclusions: Schistosoma japonicum spread from Jiangxi to other parts of East Asia and Southeast Asia. The parasites have close genetic relationships.