2. AIDS is a very harmful infectious disease, which is caused by HIV infection. HIV is a virus that can attack the human immune system. It takes CD4T lymphocytes, the most important cells in human immune system, as its main target, and destroys them in large quantities, making human body lose its immune function. Therefore, the human body is susceptible to various diseases, malignant tumors can occur, and the mortality rate is very high. The average incubation period of HIV in human body is 8 ~ 9 years. Before you get AIDS, you can live and work for many years without any symptoms.
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