Until 1970s, It was regarded as a protozoan and could cause diarrhea, there were still many contradictions about the relationship between diarrhea and Blastocystis hominis.

• 直到上世纪70年代，才被认为是一种原虫并且可以导致腹泻，但人芽囊原虫和腹泻的关系仍然没有研究清楚。