###Human: Kindly guide me about the tests taken to confirm HIV status. ###Assistant: Hi. Regarding HIV infection, the window period (or period in which a person might test negative for the virus but actually be positive because of a delayed immune response) is typically between 21 and 60 days. There is however some evidence that it can be as long as 180 days (six months). When there is a history of a potential transmission risk event, like having unprotected sexual intercourse, we recommend a final repeat of the antibody and antigen combo test at six months. Even though your symptoms could be explained by other infections, I would still recommend that you repeat the combo test at six months for your own peace of mind. It is also very important that you test yourself for syphilis as your symptoms, especially your rash, suggests a need to just exclude that, as it is highly treatable if found. I would strongly suggest as well that you consult with a trusted physician so that he or she can examine you clinically and help to exclude other diagnoses like upper respiratory tract infection and treat accordingly.