When HlV (AIDS virus) has invaded the body, those who have not entered the pathogenic phase are called the window period. The period of time between the entry of HIV into the body and the production of a sufficient amount of HIV antibodies in the blood to be detected by a test is called the window period. Although HIV antibodies cannot be detected during the window period, HIV is already present in the body and can be detected by the HIV nucleic acid test, so infected people in the window period are also infectious. At present, with the continuous development of HIV testing technology, the third and fourth generation of the widely used double original sandwich method and enzyme assay and chemiluminescence and other means of detection, the window period of AIDS can be shortened to 14 to 21 days. In this regard, the World Health Organization (WHO) has clearly indicated that the window period for AIDS is 14 to 21 days. Therefore, if you have been exposed to AIDS, it is recommended that you should receive HIV blocking treatment, and the earlier you receive the treatment, the better the result, generally not more than 72 hours, do not be negligent, so as to avoid delaying your condition.