What is a CD4 cell?
A CD4 cell, or T-cell, is a part of the immune system. This cell assists the immune system in mounting attacks against invaders such as bacteria, viruses and fungi. Without healthy CD4 cells, the immune system is not as likely to be successful in fighting illness. As HIV damages the immune system, the number of CD4 cells begins to decline. A doctor will monitor this level over time to look for changes. It may be a good idea for you to track this number for yourself, too.
