Performance of the Determine Ag/Ab Combo test.

Group 1: Antigen positive, antibody negative acute HIV infection (Ag+Ab−).Group 2: Antigen positive, antibody positive early HIV infection (Ag+Ab+).Group 3: Antigen negative, antibody positive chronic HIV infection (Ag−Ab+).Group 4: Antigen negative, antibody negative volunteers without HIV infection (Ag−Ab−).Group 5: Antigen false positive, antibody negative volunteers without HIV infection (Ag−Ab−).Ag: p24 antigen, Ab: HIV antibody, weak pos: the respective assay indicator was fainter than the control indicator. This is considered “positive” in our analyses, as per the package insert.