PMID: 7539472Jun 1, 1995Paper

Rapid changes in human immunodeficiency virus type 1 RNA load and appearance of drug-resistant virus populations in persons treated with lamivudine (3TC)

The Journal of Infectious Diseases
R SchuurmanC Christopherson

Abstract

The effect of the appearance of drug-resistant human immunodeficiency virus type 1 (HIV-1) on viral RNA load was studied in patients treated with the reverse transcriptase inhibitor lamivudine. During the first 12 weeks of treatment, HIV-1 RNA concentrations and amino acid changes in codon 184, causing high-level resistance to lamivudine, were determined in longitudinal serum samples from HIV-1 p24 antigen-positive and -negative patients. A marked decline in the amount of HIV-1 RNA (approximately 95% below baseline) and HIV-1 p24 antigen was observed within 2 weeks, followed by a rise that coincided with the appearance of lamivudine-resistant viruses in serum (isoleucine mutants initially, which were subsequently replaced by valine variants). After 12 weeks, a partial antiviral effect was observed despite the presence of a complete codon 184 mutant virus population in serum. This study shows that the rapid appearance of drug-resistant virus in serum is followed by an increase in viral RNA load.

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