人芽囊原虫是否具有致病性一直颇有争议，因为很多流行病学研究和实验动物研究得出了矛盾的结论。
The pathogenic potential of Blastocystis hominis is still controversial because many epidemiologic and experimental animal studies gave quite different conclusions.
在寄生虫中，原虫的致病性往往比线虫的要高。
Among parasites, Protozoa are usually more pathogenic than nematodes.
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