title: An immunoglobulin G antibody capture particle-adherence test (GACPAT) for antibody to HIV-1 and HTLV-I that allows economical large-scale screening.
abstract: GACPAT is a modification of a gelatin particle-agglutination test for the detection of anti-HIV-1 and anti-HTLV-I. In it, antigen-coated particles react with immunoglobulin captured from the specimens onto the surface of U-bottomed reaction wells previously coated with anti-gamma chains. In initial tests on 1127 blood donations, of 628 HIV-1 high-risk specimens and 176 HTLV-I high-risk specimens, GACPAT for anti-HIV-1 was 98.9% specific and 100% sensitive, and for anti-HTLV-I was 99.0% specific and 93.0% sensitive. It rivalled the sensitivity of second-generation enzyme-linked immunosorbent assays (ELISA) for anti-HIV-1 in tests on specimen dilutions and on seroconversion series. GACPAT can be used as a cheap, large-scale test and as a simple confirmatory check on other assays.
authors.affiliation: PHLS Virus Reference Laboratory, Central Public Health Laboratory, London, UK.
authors.forename: J V
authors.initials: JV
authors.lastname: Parry
authors.forename: P P
authors.initials: PP
authors.lastname: Mortimer
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control; D000372:Agglutination Tests / Q000379:methods; D000914:Antibodies, Viral / Q000032:analysis; D015497:HIV-1 / Q000276:immunology*; D015368:Human T-lymphotropic virus 1 / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology*; D007201:Indicator Dilution Techniques; D008403:Mass Screening / Q000191:economics; D010953:Plasma Volume; D011930:Reaction Time
chemical_list: D000914:Antibodies, Viral; D007074:Immunoglobulin G