It takes about 2-3 weeks from the time of HIV infection to the time of antibody positivity. High-risk people can have their blood tested for HIV antibodies after about 2-3 weeks. The time period between HIV infection and antibody production is called the window period, which is 14-21 days. However, with the advancement of testing technology, this time is being shortened, and some can be tested in about 1 week. For patients infected with HIV, some may not have any symptoms, while others may have flu-like symptoms at the beginning of the infection, such as fever, sore throat, joint pain, diarrhea, etc. The symptoms are not very serious and do not require special treatment, and can be cured by themselves after 1-3 weeks.