HIV antibodies usually appear 2-4 weeks after the infection, because the window period is after the infection, the window period does not appear HIV antibodies, the window period is usually 2-4 weeks, after 2-4 weeks into the acute phase, HIV antibodies will be positive, at this time also CD4+ T lymphocytes are significantly declining. After HIV attacks the human body, it mainly attacks CD4+ T lymphocytes, which are the most important immune cells in the human body, causing a significant decrease in CD4+ T lymphocytes, resulting in a decrease in immune function and loss of immunity. The typical clinical symptoms during the acute phase include fever and swollen lymph nodes.