T cells

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Colorful illustration of T Cell and HIV, showing CD4 receptor, coreceptor, and GP 120.

Learn about CD4 cells – what they are, how HIV affects them, CD4 tests and CD4 counts, and what these mean for HIV infection and treatment.

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Person dressed in medical garb holding sign that reads "Immune System".

Get basic information about how the immune system works, its key parts, and how HIV can damage it.

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