The window period of AIDS in adults is the time from HIV infection to the formation of antibodies, usually 45 days, 2-8 weeks for blood transfusion infection, and 2-3 weeks for sexual intercourse infection. The incubation period is the time from HIV infection until the appearance of signs and symptoms of AIDS, averaging 12 months for children and 29 months for adults, with individual cases lasting more than 5 years or up to 10 years. Overall, the time from HIV infection to the development of AIDS varies from a few months to 17 years, with an average of about 10 years. After the window period, which is about 5 weeks, HIV antibodies can be detected in the blood, so people with high-risk behavior and unclean sexual contact can get tested for HIV after the window period.