Author(s): Qiu M, Liu X, Jiang Y, Nkengasong JN, Xing W, , Qiu M, Liu X, Jiang Y, Nkengasong JN, Xing W,
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Abstract A significant number of HIV-2 infections have been reported in China using Western blot as per current guidelines for HIV-2 diagnosis in China. However, most specimens were also positive on HIV-1 Western blot suggesting cross-reactivity and possible overestimation. We carried out the current study to evaluate a strategy to diagnose the HIV-2 infections in China. A total of 119 specimens received from 16 provinces were likely to be HIV-2 when tested according to current guidelines in China using the Genelabs Western blot (HIV Blot 2.2 WB). Further testing by HIV-2 WB (Bio-Rad New LAV Blot II or Genelabs HIV Blot 1.2 WB) scored 56 (47.1\%) of 119 samples with banding pattern suggestive of HIV-2 infection, and 63 (52.9\%) were HIV-2 indeterminate. A peptide-based HIV-1 and HIV-2 enzyme immunoassay for differential diagnosis of HIV-1 and HIV-2 infections was validated and used. This in-house EIA demonstrated that only 1 (0.8\%) of 119 specimens had HIV-2 specific antibodies, while 2 (1.7\%) were dually reactive. These results were highly concordant (>99\%) with those by Inno-LIA HIV-I/II (Innogenetics, Belgium), which also use specific peptides for type-specific diagnosis. Our data demonstrates that HIV-2 infection is rare in China, and HIV-2 Western blot may overestimate the prevalence of HIV-2 in the population with HIV-1. The HIV-2 diagnostic strategy in China needs to be revised to include more specific peptide-based immunoassays. Copyright 2009 Wiley-Liss, Inc.
This article was published in J Med Virol
and referenced in Journal of AIDS & Clinical Research