- At any age >18 months: HIV-1 antibody reactive on two different manufacturers' licensed rapid tests based on a different antigen preparation and/or different test principal, or repeatedly reactive on a licensed enzyme immune assay (EIA)and confirmed on a second sample by any one of the following assays: rapid test (a third manufacturer), licensed EIA, Western blot, chemi-luminescence assay, or plasma RNA with a viral load > 5,000 copies/mL