Blood donations can be tested for AIDS, a very dangerous infectious disease. Blood is used for transfusion to patients or people in need, and the presence of the AIDS virus in the blood can cause infection in the transfused person. HIV antibodies can be detected 3 weeks after infection, and HIV RNA can be detected about 7 days after an infected person is infected with HIV, which is relatively accurate. Once HIV infection is diagnosed, you should go to the hospital as soon as possible to get a clear picture of the impact of the virus on your body through the appropriate tests, and start taking antiviral drugs immediately to prevent further damage to your body.