The human body hosts hundreds of bacterial species that perform various salubrious housekeeping chores, from aiding digestion to helping the immune system identify foreign invaders.

人类身体携带有几百种细菌物种，这些细菌负责各种有益健康的例行工作，从帮助消化到帮助免疫系统确认外来入侵物。

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It also may help support your immune system, which in turn could help your skin fight off bacterial acne.

它可以帮助你增强免疫系统，进而使你的皮肤战胜细菌。

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The two most significant chemotactic agents for neutrophils are bacterial products and components of the complement system.

两种最为有效的中性粒细胞趋化因子是细菌产物和补体系统片断。

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We'll learn more about that in a moment, but basically it allows the immune system to distinguish between viral and bacterial pathogens, and respond appropriately depending on the type of pathogen that's there.

我们一会儿会学到不少,但基本上说,这样一来免疫系统,就能够分辨出病毒和细菌病原体,并对相应的病原体类型,产生合适的免疫反应

耶鲁公开课 - 生物医学工程探索课程节选

In the face of a real viral infection it may mean that the attention of the immune system is diverted letting a bacterial infection in.

BBC: 'Wrong' immune response aids TB

It can carry Lyme disease, a bacterial infection which can attack the skin, heart and nervous system.

BBC: NEWS | UK | Magazine | Itching to get at you

Bacterial vaccines, which used modified bacteria to try to train the immune system to fight the HIV virus.

FORBES: HIV Vaccines: The Shotgun Approach