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HIV/AIDS Diagnostics: Immuno-PCR for HIV-1 p24 antigen lowers HIV-1 viral load detection limits

AIDSWEEKLY Plus; Monday, September 6, 2004
Staff Medical Writers


NewsRx -- According to recent research published in the American Journal of Clinical Pathology, "Presently, the assay that attains maximal sensitivity and dynamic range of HIV-1 viral copy number (50 copies per milliliter) is nucleic acid amplification of HIV RNA in plasma.

"Enzyme-linked immunosorbent assay (ELISA) methods for quantification of HIV-1 p24 antigen have been relatively insensitive. In this report, we show data that indicate real-time immuno polymerase chain reaction (IPCR), a combination of the ELISA and PCR techniques, is more sensitive for HIV-1 p24 antigen detection than other currently reported methods."

"When derived from an IPCR standard curve, a dose response was observed from patient samples with known viral loads diluted within a 3-log range (1.68-6,514 viral RNA copies per milliliter). IPCR detected 42% (22/52) of patient samples that had fewer than 50 viral RNA copies per milliliter by reverse transcriptase-PCR," J.M. Barletta and colleagues reported.

"IPCR shows the potential to become the most analytically sensitive test available for determination of HIV-1 viral load by the detection of HIV-1 p24 antigen," scientists concluded.

Barletta and colleagues published their study in American Journal of Clinical Pathology (Lowering the detection limits of HIV-1 viral load using real-time Immuno-PCR for HIV-1 p24 antigen. Am J Clin Pathol. 2004 Jul;122(1):20-7.

For additional information, contact J.M. Barletta, University of Maryland, Department of Pathology, 725 W Lombard St., Baltimore, MD 21201 USA.

The publisher's contact information for the American Journal of Clinical Pathology is: American Society Clinical Pathology, 2100 W Harrison St., Chicago, IL 60612 USA.

The information in this article comes under the major subject areas of Immunology, AIDS/HIV, Diagnostics, Biotechnology, and Virology.

This article was prepared by AIDS Weekly editors from staff and other reports.

Reference

Barletta JM, Edelman DC, Constantine NT. "Lowering the detection limits of HIV-1 viral load using real-time immuno-PCR for HIV-1 p24 antigen", Am J Clin Pathol. 2004 Jul;122(1):20-7.

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