Glossary

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T cell

Small, disease-fighting white blood cells (also known as T lymphocytes) involved in immune defense. T cells include CD4 cells and CD8 cells, which are both critical components of the body’s immune system. T cells are the main target of HIV in the blood, and they act as the host that the virus needs in order to replicate. Because it targets and “hijacks” immune cells, HIV is particularly destructive on the immune system.