Comparison of two measures of human immunodeficiency virus (HIV) type 1 load in HIV risk groups

Cynthia M. Lyles, David Vlahov, Homayoon Farzadegan, Jacquie Astemborski, Joseph B. Margolick, Beth A. Masters, Jennifer Schroeder, Thomas C. Quinn

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Levels of viral burden were compared across risk group and gender populations among 485 human immunodeficiency virus type 1 (HIV-1)-infected participants consisting of 190 male injection drug users (IDUs), 92 female IDUs, and 203 homosexual men. Viral burden was quantified by a microculture technique to determine cell-associated infectious units per 106 peripheral blood mononuclear cells (IUPM) and by reverse transcriptase PCR (Amplicor) to determine plasma HIV RNA levels. Adjusting for CD4+ cell count, females had a lower infectious HIV load than all males combined (0.33 log10 lower; P = 0.004), and homosexual men had a 0.29 log10 higher infectious viral load than all IDUs combined (P = 0.001). For HIV RNA levels, females had lower levels than males (0.19 log10 lower; P = 0.04), but no differences were observed by risk group. After controlling for percent CD4+ cells, no differences were found by risk group for either assay, but females still had a 0.25 log10 lower infectious viral load than males (P = 0.04) and a viral RNA load similar to that of males (P = 0.25). The correlation between infectious viral load and HIV RNA load was 0.58 overall, which did not differ by gender or risk group. Our data suggest that differences in viral load may exist by gender and that any differences observed by risk group are driven predominantly by gender or percent CD4+ cell differences. These data also confirm a moderate correlation between cell-associated infectious viral load and plasma HIV RNA load, which appears to be similar by gender and across risk groups.

Original languageEnglish (US)
Pages (from-to)3647-3652
Number of pages6
JournalJournal of clinical microbiology
Issue number12
StatePublished - Dec 1998

ASJC Scopus subject areas

  • Microbiology (medical)


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