Syphilis can usually be ruled out in about 1 month after high-risk behavior, and HIV can be ruled out in about 3 months. The period of time between the entry of the HIV virus into the body and the production of a sufficient amount of HIV antibodies in the blood to be detected by testing is called the window period. Therefore, it is not possible to detect whether you have AIDS right away. Usually, after three months, you can determine whether you are infected with AIDS through antigen testing, viral load testing, and so on. Like AIDS, syphilis also has a window period, which is shorter than that of AIDS, and it usually takes about a month to determine if you are infected with syphilis. If you have high-risk behavior, it is recommended that you seek help from an infectious disease department, an HIV sentinel testing facility, or the CDC within 72 hours after the fact. The doctor will evaluate the patient, and once you have been found to have high-risk behavior, you can take a blocking medication on the doctor’s advice. Although it is a 72-hour blockade, it can be stopped as early as possible, and the shorter the time the patient takes it, the shorter the time it takes to allow the virus to be intercepted before it enters the bloodstream, and the success rate of the blockade is relatively high.