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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 ...
The body then loses the ability to fight infections. AIDS can affect every body system. Systems Affected- 1. Immune System HIV destroys CD4 cells, the white blood cells that help the immune system fight off disease. 2. Respiratory System As HIV develops into AIDS, infections such as pneumocystis pneumonia or PCP can cause severe respiratory conditions. 3.