微孢子虫是一种蜂类病原体，它也困扰欧洲的大黄蜂。
Nosema bombi is a bee pathogen that has also afflicted European bumble bees.
显微镜下可见的有单细胞原生类寄生虫，例如阿米巴和孢子虫，真菌及细菌，这些均能感染动物及植物。
Microscopic parasites include single-celled protozoans such as amoebas and sporozoa, fungi, and bacteria, which can infect animals and plants.
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