Far East Asia shows a lot of epidemiologic situations in functions of
various species of schistosomes seen. Some of them are widespread, Som
e are only seen in animals (Schistosoma sinensium), when others are ca
use of zoonotic infections (Schistosoma japonicum, S. malayensis, S. m
ansoni-like). Except for S. mansoni-like from Thailande, all other spe
cies belong to the japonicum complex. Its particularity is to have und
ergrown a concomitant evolution with its intermediary hosts from a com
mon ancestor.