HIV uses human cells, mainly white blood cells, as host cells to in which to replicate and thrive. The white blood cells that HIV uses as host cells are called CD4 T-lymphocytes, which are commonly called "CD4 cells" or "T-cells" for short. The numbers of these cells are what are referred to when someone discusses a "CD4 count," or a "T-cell count."
CD4 cells are used to fight infection and are a key element of the immune system. In the process of replication, HIV kills CD4 cells. By replicating and killing CD4 cells, HIV degrades the immune system and renders the patient more susceptible to infections that would otherwise be easily fought off. An adult with a healthy immune system generally has a CD4 cell count of from 600 to 12001
CD4 cells are used to fight infection and are a key element of the immune system. In the process of replication, HIV kills CD4 cells. By replicating and killing CD4 cells, HIV degrades the immune system and renders the patient more susceptible to infections that would otherwise be easily fought off. An adult with a healthy immune system generally has a CD4 cell count of from 600 to 12001
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