Among the many waterborne disease-causing viruses are hepatitis a and norwalk; the pathogenic protozoa include cryptosporidium entamoeba and giardia.
而主要的水媒病毒为a型肝炎病毒及诺华克病毒；会引起疾病的原生动物，则包括隐孢子虫、内阿米巴原虫、梨形鞭毛虫等。
Among parasites, Protozoa are usually more pathogenic than nematodes.
在寄生虫中，原虫的致病性往往比线虫的要高。
Man is host to a variety of pathogenic bacteria, protozoa, and viruses.
人是各种致疾的细菌、原生动物以及病毒的宿主。
Man is host to a variety of pathogenic bacteria, protozoa, and viruses.
人是各种致疾的细菌、原生动物以及病毒的宿主。
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