With the help of a microscope, we can find that the world around us is actually full of danger: pathogenic microorganisms are everywhere. In order to fight against those "invaders" who threaten survival or find out the "traitors" in the body, the human body has developed a set of fine and complex defense and monitoring mechanisms, which is the immune system. The immune system is charged with the task of defending its own security. Under the surface calm life, the immune guards always advance one after another and fight with the enemies in the body all the time.
White blood cells are the main force of these immune guards. In fact, white blood cells are just a general term. In the large white blood cell family, they are also divided into neutrophils, macrophages, lymphocytes, dendritic cells and other types. They have a clear division of labor and play different roles in different infection situations. For example, in the early stage of infection, neutrophils and macrophages play a major role. While sending messages to greet more companions, they fight with invaders to devour and destroy their opponents; A few days later, lymphocytes began to take the main responsibility for fighting. They can not only secrete antibodies and neutralize toxins, but also stimulate killer cells in the body to encircle and suppress infected objects. After a successful battle, lymphocytes can also preserve memory so that they can act more quickly and effectively the next time such invaders invade.
However, the entry of HIV greatly disrupts and destroys the work of leukocytes. HIV can infect many kinds of white blood cells and make the infected cells die; HIV can induce killer cells to attack infected white blood cells, making the number of white blood cells less and less; In addition, HIV will interfere with the line of sight of killer cells, make them attack innocent white blood cells, and aggravate the loss of white blood cells. Some HIV are not eager to kill white blood cells, but choose to "Lurk" in their bodies and find the right time to make waves. White blood cells carrying HIV will also carry the virus to the brain and other parts, causing brain damage.
In this way, as HIV infection becomes more and more serious, the number and function of leukocytes become worse and worse, and the defense ability of the human immune system becomes lower and lower. At this time, once a pathogenic microorganism enters the body, the human body will be unable to stop it; At the same time, some normally self-contained microorganisms will also take the opportunity to defecte, causing some rare infections under normal circumstances. Because the ability of immune surveillance is reduced, the cells in the body are also easier to escape, so AIDS patients are prone to suffer from tumors. Ultimately, AIDS patients will die of incurable infections and tumors.