The latest standard for the HIV window period is 14 to 21 days. The AIDS window period is the period between when HIV enters the body and when the body is able to produce a sufficient amount of detectable HIV antibodies. It is usually difficult to detect antibodies during the AIDS window period, and patients are contagious and easily infected. The first HIV infection may be accompanied by fever with early symptoms such as sore throat, night sweats, nausea, vomiting, and skin rash. Different HIV testing techniques correspond to different window periods. The most common paper test is the HIV (Human Immunodeficiency Virus) antibody test, which has an average window period of about 22 days; the window period for the HIV antigen antibody test is about 13 to 18 days.