HIV testing technology in US needs to change or risk missing acute infections
Posted in HIV testing on June 29th, 2009 by hiv_test – Be the first to commentA fourth generation HIV testing assay detected almost two-thirds of individuals with acute HIV infection, investigators report in an article published in the online edition of the Journal of Acquired Immune Deficiency Syndromes. The researchers believe that their results show the ARCHITECT HIV Ag/AB Combo Assay to have significant advantages, including the time needed to obtain a result compared to the current pooled HIV RNA testing strategy used to diagnose acute HIV infection. Such assays are already routinely used in the United Kingdom.
Diagnosis of acute HIV infection relies on detection of HIV virus using viral load tests, or p24 antigen. Pooled HIV viral load testing has been shown to be an effective means of diagnosing acute infections. However, it is slow, it typically taking between seven and 21 days to obtain the results, cumbersome, and labourious. It is therefore not a realistic technology for resource-limited settings, nor for addressing the problem of ongoing transmission from people during acute infection.
The ARCHITECT Combo assay was positive for 13 of the 21 acute samples. The median viral load of individuals testing positive with this technology was significantly higher than that of individuals testing negative (662,ooo copies/ml vs. 3576 copies/ml).
“The failure to diagnose acute HIV infection represents an important public health problem”, note the investigators, “persons with primary infection may be up to 10 times more likely to transmit HIV per sexual act than are individuals with established infections”.
For the complete article, please refer to http://www.aidsmap.com/en/news/D9111996-68D9-4F3D-A499-C9559819B045.asp.
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