After HIV infects human lymphocytes, people's immunity will be greatly reduced. Tell me why.

HIV is a virus that can attack the internal organs of the human body. It targets T4 lymphoid tissue, which is the most important tissue in human immune system, and destroys T4 lymphoid tissue in large quantities, leading to highly fatal internal failure. This virus is life-long infectious in this area, which destroys people's immune balance and makes the human body a carrier of various diseases. HIV itself will not cause any diseases, but when the immune system is destroyed by HIV, the human body loses the opportunity to replicate immune cells because of its low resistance, thus infecting other diseases, leading to various compound infections and deaths.