The number of patients approached for testing will be recorded as will the total number of patients registered in the ED during the period of testing (eight hours per day, five days per week). The number of reactive tests as well as the number of positive confirmatory tests will be determined. In order to determine the yield of testing and to estimate seroprevalence in the ED, the number of patients testing positive (confirmed by Western blot) will be divided by the total number tested. Further calculations will incorporate the yield of testing in those with risk factors and compare to those with no reported risk factors. In addition, the number of patients with reactive tests attending an initial and subsequent HIV clinic visit as well as the number presenting with an AIDS diagnosis and the number commencing antiretroviral therapy within one year after testing will be recorded.