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HIV targets the type of cells that would normally fight off an invader like HIV. As the virus replicates, it damages or destroys the infected CD4+ cell and produces more virus to infect more CD4+ cells. Without treatment, this cycle continues in most infected people until the immune system is badly compromised, leaving them open to many serious infections and illnesses. Many of the illnesses that people with compromised immune systems get are rare in people with functioning immune systems.
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Enemy bacteria and viruses attack with a variety of strategies. Some of the enemies attempt to disguise themselves to evade detection, some come in a great variety of shapes to confuse the security, and some come with brute force in an attempt to overwhelm the security. The immune system must therefore be able to distinguish between all the various enemies and at the same time leave the body itself in all its variations untouched and safe. It is indeed an amazing array of highly trained and adaptable warriors. They are at the same time very gentle with the body but merciless with the enemy.
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It is a virus that gradually weakens the immune system until the body cannot fight off common infinitesimal infections such as pneumonia, diarrhea, the “flu”, and other illnesses.
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When HIV enters the body, it goes straight for the CD4+ T cells that are a lynchpin for the operation of the entire immune system. As the virus infects and kills more of these T cells, your immune system grows weaker, and you become more susceptible to illness.