The average duration of HIV incubation in adults is about 6-8 years. For individuals, this time is variable, some will be more than ten years, some will be about a year, depending on the number of HIV infections and the immune status of the individual’s organism. AIDS is caused by infection with the human immunodeficiency virus, which mainly attacks the immune system and causes a decrease in immune function. At the beginning of the infection, there will be transient flu-like symptoms, after this stage, generally the HIV virus will be latent in the body, it will slowly reduce the body’s immune cells, resulting in a gradual decline in immune function. When the CD4 cells drop to a certain level, it will enter the AIDS stage, and some AIDS patients even develop opportunistic infections.