The HIV disease weakens the body's immune defenses by destroying CD4 (T-cell) lymphocytes, which are white blood cells that protect us from attacks by bacteria, viruses and various damaging pathogens. When these white blood cells are destroyed or weakened, they will no longer be effective as defending the body against infections.

Additionally, HIV infection increases the severity of some mere diseases and conditions. It also increases the possibility of getting some cancers.

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