AIDS enters the body and attacks the body’s immune cells, but it takes a certain amount of time, and when it produces a sufficient amount of the virus and can be detected with a test for antibodies to the AIDS virus, it is called the window period of AIDS. Although no antibodies to HIV can be detected during the window period of AIDS, HIV is present in the body and can now be detected by HIV nucleic acid, so people infected during the window period are equally infectious. According to the World Health Organization (WHO), the window period of AIDS is about 14-21 days. There are no special clinical manifestations during the window period of AIDS, and most of them are the same as normal people. If AIDS enters the onset phase, there will be transient symptoms similar to the flu, fever, malaise, and a generalized rash, while the incubation phase is asymptomatic, and once symptoms appear, they can usually be detected.