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Understanding the Immune System. ...) that can fight different diseases. As HIV disease progresses, the number of CD4 cells drops. The first CD4 cells that HIV attack s are the ones that specifically fight HIV. Some type s of CD4 cells can disappear, leaving gaps in the immune ...
How HIV infects the body and the lifecycle of HIV. RS16_iStock-640012070-lpr.jpg. FAST FACTS: HIV cannot multiply on its own. HIV attaches itself to an immune system âT-helperâ cell, fuses with it, takes control of its DNA, replicates itself inside the cell, and then releases new HIV into the blood.