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J Clin Virol. 2014 Sep;61(1):166-9. doi: 10.1016/j.jcv.2014.06.015. Epub 2014 Jun 24.

Evaluation in a clinical setting of the performances of a new rapid confirmatory assay for HIV1/2 serodiagnosis.

Author information

1
Laboratory of Virology, INMI, L. Spallanzani, Rome, Italy. Electronic address: isabella.abbate@inmi.it.
2
Laboratory of Virology, INMI, L. Spallanzani, Rome, Italy.
3
CRAIDS and Clinical Department, INMI, L. Spallanzani, Rome, Italy.
4
Clinical Department, INMI, L. Spallanzani, Rome, Italy.
5
Scientific Direction, INMI, L. Spallanzani, Rome, Italy.

Abstract

BACKGROUND AND OBJECTIVES:

The performances of the new Geenius rapid confirmatory test (Bio-Rad) were evaluated with emphasis towards identifying acute infection (AHI) and discriminating HIV-1/2 in a clinical setting

STUDY DESIGN:

Serum samples from individuals attending the L. Spallanzani Institute in Rome, Italy, for HIV diagnosis (one year retrospective collection), repeatedly reactive at 4th generation HIV-1/2 screening assays, confirmed with HIV-1 and HIV-2 Western blot (New LAV I and II Bio-Rad), were retested with Geenius.

RESULTS:

Of 6,200 samples, 406 resulted repeatedly reactive at screening, including samples from clinically confirmed AHI. New LAV I identified 378 HIV-1-positive samples. Of these, Geenius found 377 HIV-1-positive and one unclassified HIV-positive. New LAV I classified as indeterminate 18 samples, including 14 from AHI. Among these 14, Geenius results were: 12 positive, 1 indeterminate and 1 negative. Of the remaining, 2 resulted Geenius negative (false-positive screening results) and 2 HIV-2. Ten samples were New LAV I-negative (5 AHI). Geenius results were: 1 (AHI) positive and 9 negative. Geenius detected 110 additional positive samples with no p31 reactivity with respect to New LAV I, with an almost similar prevalence of low avidity samples. Geenius confirmed 3 out of 4 HIV-2 infections identified by New LAV II (one coinfected with HIV-1), while rated as HIV-1 the remaining sample, classified as coinfection by New LAV I and II.

CONCLUSIONS:

Geenius allows fast, sensitive and accurate confirmation of HIV serodiagnosis, including AHI and HIV-2 infections. The high sensitivity, in particular towards AHI, could avoid additional sampling and molecular tests.

KEYWORDS:

Acute infection; Avidity; Diagnosis; HIV; Western blot

PMID:
25037532
DOI:
10.1016/j.jcv.2014.06.015
[Indexed for MEDLINE]

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