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1·At this concentration, control of protozoan parasites can be achieved.

在此浓度，控制原生动物寄生虫是可以实现的。

2·Cryptosporidiosis (crypto) and isosporiasis are both caused by protozoan parasites.

隐孢子虫病（crypto）和等孢球虫病都是由原生动物寄生虫引起的。

3·Hundreds of millions of people world-wide are infected each year with protozoan parasites.

成千上万的人被感染，全世界每年疟原虫引起。

4·Protozoan parasites of the phylum Apicomplexa include some of the most important causative agents of human and animal diseases, in particular, malaria.

顶复门类的原生动物寄生虫包括造成一些最重要人类和动物疾病的病原体，特别是疟疾。