After becoming infected, the CD4 cells are destroyed by HIV.

之后，成为被感染，CD 4细胞被摧毁，受艾滋病毒。

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Although the body will attempt to produce more CD4 cells, their Numbers will eventually decline and the immune system will stop working.

虽然身体会尝试制作更多CD 4细胞，他们的人数将最终下降和免疫系统将停止工作。

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Left untreated, HIV will lower the number of CD4 cells in your body to a dangerously low level, and your immune system will stop working.

如果不予治疗，艾滋病毒会降低多少CD 4细胞在你的身体到一个危险的低水平，且您的免疫系统将停止工作。

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For example, HIV enters cells of the immune system by binding to a receptor called CD4.

比如,HIV通过与CD4的受体结合,进入到免疫系统细胞中

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Two specific types of immune system cell that attack invaders - CD4 T-cells and natural killer cells - increased in number with age, with a higher rate of increase in women than in men.

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This consists of two sugar-protein molecules known as gp120 and gp41 that react with a protein called CD4, which is found on the surface of certain cells of the immune system.

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