title: GACPAT HIV 1 + 2: a simple, inexpensive assay to screen for, and discriminate between, anti-HIV 1 and anti-HIV 2.
abstract: A simple and cheap assay suitable for screening for anti-HIV 1 and anti-HIV 2 and discriminating between them was evaluated. In it specimens are incubated in U-bottomed microplate wells coated with anti-human IgG for 30 min at room temperature. After washing, 100 microliters of a 1 in 50 dilution of HIV 1-coated gelatin particles (Serodia-HIV 1/2, Fujirebio) are added. Settling patterns are read on the second day: A positive reaction is indicated by adherence of the particles and a negative by a button. The HIV 1 particles are then washed away and HIV 2 particles added. Anti-HIV 2 reaction patterns are read on the third day. To assess the performance of the modified "GACPAT HIV 1 + 2" assay a panel of 1,621 serum/plasma specimens was used. It comprised validated anti-HIV 1 positive (n = 220), anti-HIV 2 positive (n = 214), dual anti-HIV 1/anti-HIV 2 positive (n = 11), and anti-HIV negative (n = 1,176) serum/plasma specimens. All 434 specimens that contained anti-HIV 1 or anti-HIV 2 reacted positively with the homologous particles. The 11 dually positive specimens reacted positively with both HIV 1 and HIV 2 particles. Five (2.3%) anti-HIV 1 and five (2.3%) anti-HIV 2 positive specimens gave positive reactions with both particle types, but none of the five cross-reactive anti-HIV 2 specimens were dually reactive when the order of particle addition was reversed.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Hepatitis and Retrovirus Laboratory, Central Public Health Laboratory, London, United Kingdom.
authors.forename: J V
authors.initials: JV
authors.lastname: Parry
authors.forename: J A
authors.initials: JA
authors.lastname: Connell
authors.forename: P
authors.initials: P
authors.lastname: Reinbott
authors.forename: A B
authors.initials: AB
authors.lastname: Garcia
authors.forename: F
authors.initials: F
authors.lastname: Avillez
authors.forename: P P
authors.initials: PP
authors.lastname: Mortimer
mesh_terms: D015492:AIDS Serodiagnosis / Q000379:methods*; D015483:HIV Antibodies / Q000097:blood*; D015658:HIV Infections / Q000276:immunology / Q000821:virology; D015497:HIV-1 / Q000276:immunology*; D015498:HIV-2 / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007163:Immunosorbent Techniques; D012680:Sensitivity and Specificity; D013045:Species Specificity
chemical_list: D015483:HIV Antibodies; D007074:Immunoglobulin G