病毒是专性的细胞内寄生物。
弓形虫是细胞内寄生虫，能感染大多数哺乳动物。
Toxoplasma is an obligate intracellular parasite, and it infects majority mammals.
目的布鲁氏菌是兼性细胞内寄生菌，能够在吞噬细胞内长期存活并繁殖，引起家畜流产和人的波浪热。
Brucella SPP are the facultative intracellular pathogens with the ability to survive and multiply in phagocytes, and they can cause abortion of pregnant domestic animals and undulant fever in humans.
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