PubMed · 10862241
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E Weir. 2000-05-30. Rapid HIV testing.. https://pubmed.ncbi.nlm.nih.gov/10862241/
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OBJECTIVE: To corroborate the validity of the recently developed sensitive/less sensitive (S/LS) dual enzyme immunoassay (EIA) strategy for the detection of recently infected individuals and to genetically analyze recently transmitted strains of HIV-1 in a US blood donor population. DESIGN: The S/LS EIA strategy was used to identify 33 recently infected subjects among 281 enrolled HIV-1 seropositive blood donors (from a total of 410 HIV-1 infected subjects identified from 5 230 463 blood donations screened by participating US blood centers in 1995-1996). METHODS: We analysed three host response and viral characteristics were associated with recent HIV-1 infection: rapidly increasing EIA optical density (OD) values, genetically homogeneous env gene quasispecies, and putative non-syncytium inducing env V3 loop sequences. The drug resistance genotypes of the recently transmitted strains were determined by DNA sequencing. RESULTS: Increasing EIA OD values, clonal HIV-1 quasispecies and V3 loop sequences with inferred NSI phenotypes were generally detected in LS EIA non-reactive samples. Thirty-two subtype B and one CRF02_AG recombinant HIV-1 were detected. Genetic evidence for drug resistance to zidovudine (K70R) and non-nucleoside analog reverse transcriptase inhibitors (V108I) was detected in one strain each, and three other strains showed the presence of accessory protease inhibitor resistance mutations. CONCLUSIONS: Immunologic and virologic results further substantiate the validity of the S/LS EIA strategy for the detection of recent infections and illustrate its use for targeting molecular and epidemiological investigations to incident cases identified from large cross-sectional screening programs, rather than the more costly and logistically difficult longitudinal studies.
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