支原体属支原体属大量寄生的、致病的微生物，它们没有真正的细胞壁，呈格兰氏阴性并且生长时需要类固醇（比如胆固醇）。

Mycoplasma that lack a true cell wall, are gram-negative, and need sterols such as cholesterol for growth. In human beings, one species is a primary cause of nonbacterial pneumonia.

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衣原体属微生物，贝宗（氏）体属微生物一种衣原体属微生物群，是一种专性细胞内的寄生虫，包括颗粒性结膜炎、鹦鹉病、淋巴肉芽肿的病原体。

Any of a group of microorganisms of the genus chlamydia that are obligate intracellular parasites and include the causative agents of trachoma psittacosis and lymphogranuloma venereum.

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人口增长还导致人们与家禽比邻而居，造成了病原体跨越种属屏障的进化压力和机会。

Population growth also puts people in close proximity to domestic animals, creating evolutionary pressures and opportunities for pathogens to jump the species barrier.

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