AIDS caused the body's immune system deficiencies, from the more serious illnesses.

艾滋病致使人体的免疫系统功能缺失，从此小病大病不断。

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The key is to prevent deficiencies that can compromise the immune system.

关键在于防止因营养缺乏而导致免疫系统受损。

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BACKGROUND. : Genetically defined deficiencies in key components of the innate immune system have been associated with a greater risk of infection.

背景：天然免疫系统重要组份已明确的遗传缺陷与高感染风险相关。

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